Fangraphs literally just reevaluated him at #59. Baseball America dropped him from #12 to #21, and as per their comments on him after this trade - it seems they could have made a case for dropping him even further. Either way, no, he's not a Top 10 prospect anymore.
You are glossing over the concerns on him significantly. He dropped to #5 in the draft due to his arm-strength disappearing and the defensive question marks surrounding that, on top of there being worry about how much power he'd hit for. Now, both of those question marks (power and defensive outlook) look even worse than they did when he dropped from #2 to #5. Fangraphs says he hasn't looked good at either SS or CF this season (below-average arm and average speed limits his range), and his exit velocity is actually down 8 mph from college. So he has actually DECLINED in the power department.
Now, this is obviously his first pro season and you can argue that he can make adjustments, but what you are looking at is a guy who's prospective outlook as of TODAY is less than what it was to start the season. That needs to be accounted for when evaluating this trade, because ultimately when it comes to scouting the most recent sample is worth more than last year's sample.
Baseball America literally dropped him out of the Top 100. Fangraphs has him at #48, and I don't think Keith Law has him in his Top 100 or ever did. Again, read the freaking updated reports. His velocity has dropped this season and he has never had "elite" stuff. There is lots of talk about a future backend #4 or #5 starter or reliever outlook with him. Again, just like Martin: his outlook and value have regressed. The control issues out of nowhere are concerning because that was actually his best "skill"; because he's an average velocity and average breaking-ball pitcher otherwise.