The big criticism that Hard Knocks revealed was his movement and ability to create separation.
In light of that...I'm not sure his Buccaneers outing was as impressive as I initially thought. Some of those plays were better throws than routes, and weren't really indicative of his ability to create separation. Take the pretty play that Tannehill threw over the flat corner to the perimeter. That wasn't a keen route or separation. That was a great throw with great timing to the hole between zones. Take the would-be touchdown as another example. Wallace created no separation really, but Wallace is huge and tough to come through so Tannahill threw the ball low to the ground, where Wallace would have a shot at catching it but the corner wouldn't...and in the end Wallace couldn't hang on. Even if he hung on that's a better throw and decision than route or catch.
His other plays involved two slants and a curl. One of the slants the corner clearly gave up the separation by staying home in his zone, and the linebacker Hayward was late to come over to rob the passing lane. He ran the curl well, but even on that play the separation was purely zone related.
The first slant he caught, the best part about it wasn't separation but what he was able to do after the catch, breaking a tackle. I don't remember if he created separation himself in that situation or if it was the zone that gave him the separation.
I watched the other routes and there was very little separation unless it was given up by the corner in his zone coverage. The corner passed him off to the next zone. The one instance where I saw him create real separation was one where he used his hands really well to disengage.
This could be something to keep an eye on.