^Interesting idea, but I do not think there has been any real evidence to support it, and a little too Saiyajin for my taste (your theory, more or less, is that Blackbeard becomes stronger with the more damage he takes, similar to a Saiyajin's ability to evolve after a battle).
A fast and easy way to gain evidence for such a theory is for Blackbeard to fight an opponent a second time, and since he is currently in Impel Down, if Blackbeard now has an immunity (or some sort of resistance) to Magellan's poison, then that could show that Blackbeard abosrbs attacks.
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