Baam's greatest asset is his sheer potential for improvement. The thing is, that potential takes time to grow, and a lot of training as is evident up until this point. We're at a point in the story where the power scaling is going to gradually become astronomically more broken (and that's not a bad thing. It just means that the gaps between characters gets huge), and the likes of Kallavan, who people like Yuri worry about are far beyond Baam's current output. I doubt Baam could top Yuri at the moment, and Kallavan is possibly mightier than Evankhell. Baam has zero chance of topping any of them right now.