You guys are repeatedly making the same mistake called "post-knowledge". The way Allies saw it before Summer 1945 (1st nuclear test), they will need numerous and ferocious Red Army to fight fanatical Japanese, entrenched all over Pacific. Losses were estimated in millions, and West was anxious to make to so Soviets will bear brunt of the Japanese defensive fanaticism. Churchill and Roosevelt were not weak-kneed liberals who sold Eastern Europeans to Stalin for peanuts, they were cold calculating SOBs willing to sell Polacks and Gypsies to Stalin to save WASP lives. Your plans to cut Soviet from EE by attacking Germans from South will bring two immediate results: (1) force Allies to fight best German troops, not units recovering from the Eastern Front, as IOTL Normandy and Italy, (2) sink any hope of using Soviets against Japanese in deepest sinkhole on Earth. Very, very realistic.
Again, I think you're guilty of the post-knowledge. I don't think Allies saw Tito as omnipotent ruler of post-WWII Yugoslavia. Much more likely they hoped to pull Kostunica on him (use less evil Commie monster to fight Nazi monster and then discard Commie once no longer needed). He out-witted everybody, but I don't think that many analysts could predict in in Spring 1943.
I think this statement is good illustration of deep lack of knowledge of what could Allies expect if they would try to take German army head on. Entire German Division could be fearsome fighting force on Western Front, making expensive and complicated deception operation worthwhile, but for the Eastern Front it was chump's change, negligibly small part of German forces tied by guerilla war (waged by barely literate peasants with rifles of 1893 vintage). In frontline duty, it was 10 to 50 kilmeters of thousand-miles long frontline. So guys, are you still anxious to throw good British and American boys into this kind of carnage to save Poles from Ruskies?