My audition experience was similar. Smith came to my school (he was doing a clinic that day with our band) and me and a couple others auditioned. Told me I was in on the spot. Only question at band camp was on being an alternate or not for freshman year (which I was, I shared G3, but I ended up marching in every show)
At current levels? I'm almost sure i'd be cut. I wasn't the greatest marcher when I started (and oh boy did I feel the pain of that at ISU and even moreso when I did my first DCI tour), so I probably would have been cut at the visual portion of the audition.
I think I would have made it.
Arguments for --
-- I was one of the better if not the best marcher in my high school band. I have terrible hand-eye coordination (so was never much good at ball sports) but good "rhythmic coordination."
-- By the standards of high school band nerds in Iowa, I was a pretty good athlete. I wasn't a good athlete compared to actual athletes, but cross country in the fall, track in the spring, and baseball in the summer left me in good enough shape to do what a high school or college marching band requires of you.
-- I could play really ******* loud without totally ruining my timbre. I never had the consistent range of a 1st but definitely had a "power band" right where 2nd and 3rd parts would end up.
Arguments against --
-- I was loud but far from good. I was probably the best trumpet in my high school band come by senior year, but that's not saying much. That section was bereft of talent compared to others who had a bunch of future music majors who would end up as music teachers and high school band directors themselves.
-- I never did any solo/ensemble or all-state competitions. I doubt I would have gone much of anywhere had I done so. Musical subtlety and technique was never my thing. The good news is that stuff matters far less in athletic bands, so maybe I could have overcome the fact I wasn't great at scales or sight reading.
So, I hope I'd done great on visual portion and been "good enough, he'll make us heard" on the second one.