Revan and Malak killed by a wookie squad? I don't think so. In an open battle, the wookies would need hundreds of men to overwhelm Revan and Malak. And Jedi can sense an ambush, especially Jedi of Revan's and Malak's strength. 2 Jedi CAN mow through a squad. Like Yoda and Obi Wan did in episode 3.
And I assume that Revan and Malak were friends at that time, and have fought together in combat many times. If 2 Jedi work together, covering each other, coordinating their moves they are a lot harder to kill, at least it seems that way when you watch/read such "teamfights".