Anyone know what might cause this?

[SEBanshee]

A while back my buddy and I were out riding and playing around pulling wheelies, when my throttle seemed to stick for a couple of seconds at a time and shortly afterwards, the clutch stops working and I lose all tension on the clutch lever...as if the cable had snapped but it didn't.  I took it home and took it apart.  The photo below shows what I found.  I have since put it back together with a new pressure plate and new push rod, but have yet to take it out and test it.  Does anyone know what may have caused this? 

 

http://imageshack.us/a/img35/504/bansheepressureplate.jpg

 

^^That was the only thing that I found out of the ordinary.

[trickedcarbine]

We're there little chatter marks where the fibers ride in the basket? Does the old plate have chatter marks and was it installed correctly? Was the rod welded to the ball? Is the arm on the top of the case aligned with that arrow? How about that bushing in the clutch basket, was it kinda sloppy?

That pic really doesn't show much.