From what I could tell he didn’t thrive in Ireland but as you say this seems like a step up. Unsure how that works but hope he can hit some form.
I'd say he didn't thrive in Ireland purely because of the style of play. While he hustles and harries and runs all day long out of possession, to get the best out of him offensively he needs to be playing off the shoulder of a typical #9 where he'd be working off knock downs and second phase stuff.
He makes good runs and is more than good enough with the ball at his feet. But because he's not a big physical presence, playing with the ball in the air is not going to suit him (circa 20% aerial duel success during his time in Scotland/Ireland). Balls on the ground via build up play and off knockdowns or flick-ons are more his bread and butter. He's not rapid, but he's no slouch either, so if he can get that ball on the ground and at his feet at San Antonio then I think he'll find success over there.