The Brewers made some free-agent moves for their pitching staff in 1979: Signing Jim Slaton and Reggie Cleveland.
Here is the Opening Day lineup in 1979:
2B Molitor
SS Yount
1B Cooper
C Murphy
DH Oglivie
CF Thomas
3B Money
RF Moore
LF Henderson
SP Mike Caldwell
Catcher is interesting. Current Brewers catchers (prior to 1979) are Charlie Moore and Buck Martinez. Moore hit around .270, but with little power. Martinez is more of a liability at bat. Murphy has power, and has split time at catcher and first base. Cooper emerges as an everyday player, though, so Murphy starts out at catcher, but it is soon obvious that while he is a good power hitter, he is a liabilty defensively, so the Brewers stick him in left field, and go with an Oglive/Lezcano platoon in right, with Henderson holding down center field.
Their pitching looks strong on paper going into 1979: The Brewers' 1979 rotation as planned is headlined by Mike Caldwell (22-9, 2.36 ERA in 1978) and Lary Sorenson (18-12, 3.21 ERA) with Jim Slaton returning as a free agent and Bill Travers taking the next two slots, with Moose Haas as the 5th starter, unless the Crew decides to stick with Jerry Augustine (13-12, 4.54 in 1978). So their rotation is going to be in good shape entering that season.
The bullpen may be a bigger question, since Bill Castro (5-4, 1.81 ERA, 8 saves) leads the bullpen. Castro may be underrated as a closer - note the 1.81 ERA. Bob McClure's also not shabby, either (4-7, 3.10 ERA, 15 saves combined in 1977-1978). Augustine and Andy Repogle could fill bullpen slots. The Brewers also have free-agent acquisition Cleveland (5-8, 3.08 ERA, 12 saves in 1978). So their `pen doesn't have big names, but Cleveland, Castro, and McClure look to be serviceable, with Augustine and Repogle as inning-eaters.
The 1979 bullpen is still catch-as-catch-can, but by the end of 1979, the Brewers have a few spare parts they could conceivably dangle for pitching. Murphy will have probably shown by the end of 1979 that he is an answer in the outfield. Oglivie will also have earned a spot as well - probably full-time (as he did in @ 1979). In 1979, Charlie Moore emerges as a solid contact hitter (.300 batting average). So catcher is less of a concern than it was at the start of the season.
The Brewers will be looking to unload Sixto Lezcano and Dick Davis at the very least - maybe Jim Gantner as well. They also start to view OF/1B David Green, their top prospect, as likely trade bait instead, and begin to start looking for a third baseman of the future to replace Money, who is 32.
Here is the OTL Brewer's 1978 lineup which finished 3rd in the AL East with a 93-69 record:
C - Martinez (age 29), 256 AB, .219 ave, .255 obp, .277 slg
C - Moore (age 25), 268 AB, .269 ave, .300 obp, .358 slg
1B - Cooper (age 28), 407 AB, .312 ave, .359 obp, .474 slg
2B - Molitor (age 21), 521 AB, .274 ave, .301 obp, .372 slg
3B - Bando (traded per POD prior to 79 season)
SS - Yount (age 22), 502 AB, .293 ave, .323 obp, .428 slg
LF - Hisle (traded per POD prior to 79 season)
CF - Gorman (age 27), 452 AB, .246 ave, .351 obp, .515 slg
RF - Lezcano (age 24), 442 AB, .292 ave, .377 obp, .459 slg
DH - Davis (age 24), 218 AB, .248, .273 obp, .372 slg
LF/RF/1B/DH - Oglivie (age 29), 469 AB, .303 ave, .370 obp, .497 slg
1B/2B/3B/DH - Money (age 31), 518 AB, .293 ave, .361 obp, .440 slg
UI - Gantner (age 25), 97 AB, .216 ave, .269 obp, .258 slg
Here are Murphy and Henderson's 1978 stats:
Henderson (age 19) OF in AA, 455 AB, .310 ave, .417 obp, .358 slg, 81 SB
Murphy (age 22) 1B/C in ATL, 530 AB, .226 ave, .284 obp, .394 slg
A 20 year old Henderson is NOT starting 1979 in the majors. IOTL he didn't make his debut till June 24, and the A's had a lot weaker outfield than Lezcano, Thomas, and Oglivie.
Murphy is NOT the starting catcher or rightfielder in 1979. His catching is weak and he hits worse (though with more power and more potential) than Moore. He's never played the OF and the Brewer's have Lezcano in RF who hits for average with power and threw out 18 base runners in 78.
The regular starting 9 in the first half of the 1979 season are:
C – Moore
1B – Cooper
2B – Molitor
3B – Money
SS – Yount
LF – Oglivie
CF – Thomas
RF – Lezcano
DH – Davis/Murphy
Murphy will catch at least twice a week to spell Moore. He will spot start for Cooper against tough lefties or when Cooper is given a day off/plays DH. If Murphy hits well enough, he will push out Davis at DH and he might gain an extra start a week at catcher. IOTL in 1979 Murphy only hit .257 ave, .305 obp, .421 slg away from the friendly confines of Atlanta. And Milwaukee is a big time pitcher’s park, so it is VERY difficult to see him hitting so amazing he can force one of the other starters out of a regular job. (Historically IOTL Murphy hit .281 ave, .368 obp, .499 slg at home; but only .250 ave, .324 obp, .440 slg away. Any career playing for the Brewers is going to result in much lower overall career numbers for Murphy.)
The second half of the 1979 season will see the introduction of Rickey Henderson as the everyday left fielder. IOTL in 71 at AAA in 1979 he hit .309 ave, 430 obp, 448 slg. There is no keeping him down he is that good.
The regular starting 9 in the second half of the 1979 season are:
C – Moore
1B – Cooper
2B – Molitor
3B – Money
SS – Yount
LF – Henderson
CF – Thomas
RF – Lezcano
DH – Oglivie
Murphy will get a good amount of playing time split between catcher, first base, and DH. But he won’t be a “regular”. IOTL Moore, Cooper, Molitor, Oglivie, Thomas, and Lezcano all had really, really good years with the bat. I just can’t see where Murphy becomes a regular, everybody he can replace is better than he is in 1979. If he is lucky, the manager Bamberger (who did seem very open to adjust lineups and positions), will give Murphy a shot as a spot starter in the outfield. That might expand his playing time in later years.