I have to agree with jab7345 on this one. I think for the Brett Favre scenario, somebody like Ron Wolf or John Madden would still have to be with the Raiders. Here's what I see as a best case scenario...
1990 - If the Bills go 2-4 instead of 5-1 like suggested, then the Raiders would end up with a 13-3 record as opposed to 12-4 in OTL since one of those potential Buffalo loses is to LA. Therefore, the Bills may or may not make the playoffs but if they do, they go down in wild-card flames. This gives the Raiders the home-field advantage as they defeated Miami 13-10 earlier in the year as the Dolphins would most likely be the #2 seed. Somehow, Bo Jackson avoids his career-ending hip injury in the hands of Kevin Walker, after which they play at home against Miami for the right to go to the Super Bowl instead of playing at Buffalo in OTL. The Raiders win the AFC Championship, and face the Giants in the Super Bowl. In a very boring run-oriented Raider-Giant super bowl, the tandem of Jackson and Allen run for 200+ yards, minimize turnovers, control time of possession for 35 to 40 minutes, and their defense plays well enough to limit the Giants running game. Basically, the Raiders would have to play Steeler-ball to win the big game.
2001 - I know we could use the tuck rule scenario but in this case, I will propose this: The Raiders win the last game of the season when the Jets miss the game winning FG so the Raiders go 11-5 (In OTL, Jets K John Hall made that 53 yd fg). THe Raiders win the tiebreaker by points since they never faced the Patriots that season and their divisional records are identical (6-2). As a result, the divisional game is played in Oakland as opposed to New England and the tuck rule and bad weather are completely butterflied away. Under the logic the Raiders are more refreshed from a bye week, they beat the Patriots in the 2nd round and then go on to beat Pittsburgh in the AFC Championship (the Steelers had a reputation for choking in the AFC Championship at that time) and the Raiders somehow beat the Rams in the Super Bowl.
2002 - All I can say for this is, unless Al Davis doesn't trade Jon Gruden to Tampa Bay, the Raiders DON'T face the Buccaneers in the super bowl and get their second in a row.