[@Gun]
Power doesn't work that way. You can't have a character that becomes more powerful the more powerful the opponent they face, that makes no logical sense. If you're going to have your character function at massively below-optimum capacity, then you need to explain why your character is being limited, and how this limit is removed in bigger fights. I'm personally a fan of having characters that make some degree of sense, to some level, and can't suddenly become 100x more powerful whenever they feel like it.

[@dirty slime]
He's not nearly as strong as Blackwargreymon, just as he's not nearly as powerful as Piedmon. The only reason he was able to fight Blackwargreymon at all was because of his MASSIVE power boost against darkness digimon. And even then he wasn't able to fight Blackwargreymon as an equal, as Blackwargreymon was able to hold off Wargreymon, Magnaangemon, and Shakkoumon at the same time.

Blackwargreymon is more powerful than Wargreymon, and moves at about Mach 50. Magnaangemon is nowhere near that level of power or speed.