You can do the GMY event with pretty much any 5 Jedi that are decently geared - it's a very easy event.
When you start building a "serious" Jedi team, though, you'll want to drop:
- Kanan, as he's best kept with Phoenix. Old Ben is a more versatile tank. Ideally you'll want his Devoted Protector zeta, though he's still decent without it.
- Qui-Gon - he's not terrible, but he just doesn't offer enough utility to be worth keeping on your primary Jedi team. Bastila has a lot more to work with and gives you a strong leadership ability - the massive starting protection and damage buff far outweighs Qui-Gon's extra speed, even if you don't take her zeta.
- Consular, because he's just straight up junk. Jolee is a far better healer and extremely tanky. You will definitely want his zeta so that his heal doubles as a revive.
Bastila and Jolee will also get you on your way to Jedi Revan, who is the best Jedi lead by leaps and bounds as of now.