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He survived and trained from Xo Xaan holocron like Krayt. He returns in 0 BBY, how powerful and skilled he would become?

The force potential is there; He could be very powerful at his prime; post RotS Anakin maybe. He was already powerful to begin with but was never refined in his application. Sabers, not so sure. In terms of raw skill and form; he has none so it's hard to speculate.

He has the Force potential, but is a brute and doesn't think, so he wouldn't go far

Dooku thought he would become powerful enough that the two of them could defeat Sidious. So I'd expect he would become quite formidable.

I think Dooku was delusional. He thought he was stronger than Yoda too lmfao.

Originally posted by Darth Abonis
He has the Force potential, but is a brute and doesn't think, so he wouldn't go far
Yes, just like your typical meathead.

Assuming, that Savage S3 > S4 > S5, he would lost to Ezra.