For Padme/GR Squad you need the following...... Padme, Gen.Kenobi, JK.Anakin, Ahsoka all for sure,
+ 5th variable GR
Barris is probably one of the best GR/Jedi to add to the team as she isn't needed elsewhere
Yoda works but is better eventually on the Revan Team.
C3PO also works but eventually gets used more often with.
Shaak Ti can fill in there once you get GAS.
Some like CW-Chewie even for the extra Taunt
I've seen people dump a clone in there when they didn't have the full clones team.
Even Mace could work as a filler till you get one of the better ones at the top of the list.
Myself I'm temporarily using QuiGon there since he was G11 & I didn't even have Barris open when I got
Padme. Eventually I'll replace him with her.