Sins of the forefathers

(Cross-posted to Ao3, read it there instead because it looks wayyy better)

Rainbow Steve was meant to be the saviour of his realm, to save his kind from unending evils. Unfortunately, he met a terrible end, afraid for his friends, he ultimately sacrificed himself simply because of how powerless he was, with less power to change the world than his unpowered friend.

What if he had unlocked the rest of his powers before this?

What if Rainbow Steve actually had a chance to be the saviour he was meant to be?

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TL;DR
Rainbow Steve gets to go full avatar before he dies his terrible, gruesome death