I can see the resemblance in their helmets, nice. I want a Gaius glamour even more ; ;

but I don't see a connection of the two beyond their appearance,

For a boss, Deus as raid boss would play to both Chrono and Xeno. Worthy of a Crystal Tower / Void Ark type final boss, IMO (like Cloud of Darkness), but I might be bias.

I insist though that at some point Deus would have to spawn two seraphim or cherub looking adds, Myyah and Elehaym. One to be DPS'd down ASAP (Myyah), and the other to be cure-bombed (Elehaym). If Myyah lives too long or Elehaym dies: raid wipes XD

I'm fine if Yasunori Mitsuda tracks were just easter-egg orchestration rolls for our Juke boxes, that's all I'd need to be happy

Xenogears originally was going to be FF7, but they decided it was too dark for Final Fantasy, so they remapped it's development as the next Chrono game (Chrono Cross), before deciding it was too unique for that also and made it a standalone game.

I think that alone justifies it's presence in XIV in some way, and of course there's that 'other' reason why they should do it..

..but don't mean to veer off Chrono appreciation too much