That's a full 8 v 4, and some of the 8 are reasonably formidable-
I mean, Stryfe's a guy who can grab your heart with TK and isn't bad with sabers either
Maladi's got strong sith sorcery
Qordis a cornerstone of the Brotherhood and one of the few with legit power (Kaan had to convince Qordis and one other to join, while the rest mostly fell in line because it's Kaan *and* Qordis and the third in one place).
Xedrix was able to hold of Scourge and had good lightning.... though he was old and faltering and had pretty limited endurance by the sound of it...
I think it a pretty sure thing the Jedi will take casualties. Advantage to the Jedi, sith do have a chance.