That's not a good enough explanation for Strange. As such, the yelling continues (as he pretty much ignores Lambert, sorry buddy).

"I barely held my own against Steven," Strange complains. "My power has nothing to do with it. As for potential, I've got the most potential out of anybody in the carnival."

How he came to that idea and what Strange's definition of potential is, he doesn't elaborate on. Instead, he's continuing to bitch and moan.