No. Luke goes to see Caedus in his room and when Jacen threatens him Luke pins him to his chair without even looking at him. Jacen keeps tryng to get up but Luke holds him there so strongly that his chair buckles.
I can't remember if it's that scene or another one where Luke and Jaden are talking and its revealed Luke was just an illusion the whole time.
There's also another scene where they're dogfighting and Luke starts messing up Jacens engines. Jacen tries to stop him and "he suddenly found out just how much power his uncle could bring to bare", his seat shears off the floor and Jacen breaks his collarbone on his control panel.
Yeah, this may come as a surprise to you, but I've played TOR before. What you're describing is a gameplay mechanic needed for certain playstyles, and unless told otherwise, which does happen from time to time, no companion actually needs to be there. What you did is say, "And is ____ greater than ____," as this was some definite scenario that happened. It's not. Not a single boss in this game requires a companion unless stated otherwise.
Which isn't even what I said, although this isn't true because between 1.0 and 3.0, all companions speak, and in 3.0 two out of five do. The fact is, you don't have anything concrete to prove anyone, let alone Scourge was there to face Revan. So you using him as some basis to judge how powerful Caedus would need to be to defeat Revan is flawed.