Fox's issue is he lacks explosive acceleration. He has heavy feet. He needs to work on this. This is and always has been his major weakness. And it's what scouts thought would hold him back at the pro level.
He is an elite player regardless. But imagine how much better he would be if he was a better skater.
I think there's a misconception that players can't improve their skating or skills. All it takes is acknowledgement of the weakness and then the work and time to improve.
Over the summer hit the gym and strengthen the legs, sled drags, mix up long distance runs, sprints, and hill repeaters. Get a power skating trainer. Guaranteed he would look completely different in September.