If someone were to ask Matt whether he considers Vampirism to be what made the Dietrichs who they were, his answer would be a resounding 'No.'
Because the more he learns about his body, the more he realizes that it is amazing. While it is a fact that Vampirism greatly enhances his body and causes him to gain a higher percentage of power with each workout, he feels that there is something more to it. It's as if Vampirism isn't that crucial within him.
Maybe what gives him that feeling is the fact that Vampirism is always active, and he doesn't need to do something else for the effect of said ability to kick in.
Maybe it's just a mirage or an illusion. Still, his answer was simple.
"I don't think it's because of Vampirism, but I can't understand why I think so."