That was pretty isolated to only effect that one bearing the way it did. It looks like something got clogged in the oil feed to that bearing, not the return. With that bearing spun and getting as hot as it did probably accounts for the loose nuts. The metal looks like it got so hot it's tempered.
+1 on dropping the pan. Something blocked that oil supply, more of it may be in the bottom of the pan. As said there may be more damage on the bottom end too.
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