Dependind on your arena shard. You will of course need to level, gear and star them alle.
I read somewhere that Kanan and Old Ben was proper budget alternatives for some of the harder to get toons. And QGJ is a decent attacker, but with random assist calling.
And it probably would perform worse on defence than the "expensive" Bastilla lead team.
FYI:
I ran 4* G11 zBastilla (L) with 7* G12+3 zzGMY, 7* G12 zHyoda, 7* G11 Ezra and 7* G12+3 GK in arena for a few days, and it performed way worse on defence than my six month old zzzJTR, zBB8, zzR2, zThrawn and GK team (all 7* G12+3). Feels VERY much like I wasted 4 zeta and a crap-load of gear to find that out. Thankfully we have TB, TW and STR.