@Le_Blille
Actually yes. GM Yoda has several good Omegas. Do not go for GMY's leadership. he doesn't have a ship so maxing everything just to boost Pilot GP (which boosts ship stats) isn't necessary. If you've invested a bit in his leadership, stop now.
As for Omegas, spend your first on MasterStroke, your 2nd on Yoda's basic ability (Ataru), and the third on Unstoppable Force.
Battle Meditation is worthy of a zeta, but not right away. There are other toons to zeta first since that zeta doesn't hit its stride until you've got Bastila.
Vader is also worth some Omegas, AND all your Omegas add to your ship's stats, so even if they Omegas weren't good, you'd want them just for the Pilot boost. But do Vader after you do GMY.
Order I'd do Vader is Basic then Culling Blade, then Force Crush.
Ahsoka give an Omega to her Basic only, and only after Vader and GMY (and, frankly, you might find that by the time you're ready to give her an Omega other toons have become new priorities). Ahsoka is a toon that eventually becomes great in the endgame, but you have to have a ton of gear, a ton of clones with a ton more gear, General Kenobi (from HAAT) and Jedi Knight Anakin before she comes into her own.
The only reason to develop Ahsoka now is for her ship, and even for that purpose I'd limit her to g10 max for the time being. Her day will come, though. Her day will come.