Thrust Bearing- Abnormal Wear

Are both upper and lower bearings worn the same? Maybe the middle #3 cap was not installed correctly, Last and prying the crank forward? Bad thrust surface on the crank? Too light of an oil? I've run a heavy clutch without thrust bearing problems. Like mentioned previously, something most likely was applying constant forward pressure to the crank. You should grease the pilot bushing also, it looks pretty dry.