Dunno, I think I’d still ask if he’s comfortable dressing down, that your dress code doesn’t say “may” but “should” to the informal attire.
Could be the guy would have worked out. It’s all a guessing game. At the time if felt like the right call, the guy we hired instead worked out well. But yeah, somewhere out there is a parallel universe where I think hiring the suit and tie guy was the best decision I ever made.