Shadowhunter is definitely Gaius! Look at his weapon and Gaius' concept art, it's the same!
https://vignette.wikia.nocookie.net/...FXIV_Art_3.jpg
Beyond that, he is the only garlean who could recognize Alphinaud as scion and have beef with the ascians. (I think? Livia is dead and in PotD as far as I know.)
On Yotsuyu, I thought her as primal would be cheap turn but I was so wrong. It was emotional and I admit I got teary in her final moments. Asahi got what he deserved. Patch villains don't live long but in this case I was happy it was Yotsuyu who offed him. The whole story made me wonder how many villains would have been a Tsuyu had they had a different upbringing?
The mysterious Elezen is most likely Zenos. Same eyecolor, same talking style, same move skills, talks about hunting... I only wish he snatched a Hyur body just cause I'm a bit tired of seeing Elezen since Heavensward haha, but it's just personal preference. Plus could been worse if he snatched a lalafell body lol
Anyhoooow, I think we all who speculated Zenodibus was a thing got a moment to point at the screen all - I called it!
All around very pleased with the MSQ and the hints at the new direction and new jobs in 5.0! Good job SE!