Lost bottom pulley > again ?

holy sheet metal batman, I think I see remnants of a pulley under those bolt heads.
Something there doesn't look eccentric/centered also. I don't know what difference that would make other than offset in pulley requiring overtightening the belt, which would likely bounce no matter how tight. Bolt circle in your balancer off centered? or just optical illusion in photo angle?
At second glance, it sort of looks like the pulley was captured underneath the center bolts washer.