I'm currently working on jka for g13 and then relics. I'll probably wait on han and chewie for awhile. The falcoln meta is simply too old to last much longer so putting a lot of resources into pilots for that meta is probably not the best use of limited resources.
I'm still about 20 shards from unlocking negotiator but I have most ships and pilot's fairly well geared so the switch should be pretty seemless.
Considering that most crew members are good in other areas now for gr, it wouldn't be a bad meta to switch to. Jka, ashoka, rex, fives, and gk are all parts of great teams. Plo, jedi counsuler, and clone sergeant maybe not so much but they are only 3 pilots to gear. Much better than g13 on Phoenix and several Rogue 1 characters that have very little other use in the game to keep the falcoln meta going.
And for those that think I'm hating on clone sergeant, I'm not. But he doesn't clearly fit in the 501st team and if we get a new character to fill that team in, he'll likely be the one to cut out. So, it may not be worth the g13 investment for anything other than ships.