Actually, the thought never occured to me until now but it seems very likely.

For one, you can decide whether it's Luzzu or Gatta that dies in Operation Mi'ihen, depending on the decisions you make (sorry, the prerequisite slips my mind) Generally, people will end up with Luzzu dying.

I thought it was a bit strange that Yaibal runs up to Yuna and asks her if she "remembers him" just like the other NPCs (Dona, Isaaru, Maroda etc.)

So yeah. I suppose it's likely.