Sounds like a clutch adjustment issue. Either something is causing problems with the adjustment or something like the throw out arm is bent, or dragging. Your clutch could be coming apart, I've seen it happen 1st hand, or your pressure plate could have some broken or cracking fingers.
The thowout bearing shouldn't have anything to do with disengagement, and you cannot bend shift forks (you can break them, however.) as they are made out of cast aluminum.
I'd take a look underneath the car, make sure the dust cover is properly installed still, if it's hanging down it could be rubbing on the throwout arm which could cause the adjustment issues.
As far as the rear main leaking, it's pretty doubtful it'll affect your clutch. Since the rear main is in front of the flywheel, the entire clutch assembly is shielded from the oil it leaks. Now it's technically possible the oil it's dripping could get thrown around a little, but not enough to cause major problems unless it's totally shot. Even if it was, your shifting wouldn't be effected.
Bottom line, it's something keeping your clutch from fully disengaging.
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