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He was strong.

Well, Teach wasn't able to lay a single finger on Whitebeard, he was completely overpowered by the great pirate. Shanks instead was able to clash with him, so I assume that right now Shanks is stronger than Blackbeard, and that the latter injuried Shanks in his prime, when he was still "weak".

shanks is in his prime right now lol, that means when he injured shanks, it must have been around a time he was around luffys age, or an apprentice on rogers ship, which isnt his prime, prime means most powerful form poopy