Sifu has Swiftness which makes a big difference for the rest of the team, all else being equal. Slade also gets wrekt by Mantaroth while Sifu obliterates him. Sifu hates tofu thorns though. There's a good deal of rock, paper, scissors.

Yeah, you can sell out against Keelan / Magic, that's True. I've been mixing some Squirrel in just for this purpose since it's good against Slade AND those anti Keelan teams with double true strike + archery damage.