There's really something to be said about the power of words. Because at first Inigo just quietly listens to Gladio. But then - even though he still thinks the other is pretty intimidating, if not just for the fact he looks like he could crush Inigo with a single arm the next time he makes a mess - a slightly more genuine look appears on his face. It's the kind of look a puppy has when it knows you're praising it. Just for a moment Inigo's insecure thoughts fade in the light of receiving some thanks, and the next moment he's suddenly over at the next table Gladio is working on too, helping pile the mess in one place so it's easier to get rid of.

"Well.. I guess I could help out a little more, then." There's something faintly awkward about him still, like part of him regrets having been such a drama queen about it when just plainly cooperating clearly would have gone over easier, but his mood mostly seems to be tail-wagging-puppy at this point.

".. I don't think I've seen you much around the train before."

If not just because he's pretty sure he would have gotten yelled at with all of his constant dumbassery a lot earlier otherwise.