usual suspect or unusual

putting the top ball part of xr1000 push rod into a new rockeram

and put that into another rockerarm that has been in my xr1000 engine. notice the difference there?

the cup where the push rod head sits is clearly wearing out about a millimeter. okay, now we understand that can happen. but did it really happen after i broke the pinion shaft when i was coming out of the fujispeedway last corner, up shifting from 2nd to 3rd at 7,000rpm, and before i stopped the bike about 300m later???