Is this kid a top notch fast trainer?
yes , he is a fast trainer and he can get a +150 (3 bars/practice, from the old training system).
But besides 24T you must give greens : +40 to add AMR, +40 to sa, +60 to make him 5* player, +70 to make him a good 6* player = about 200 greens.
Will he be good ? I would bet he 'll be.
But it's a lot of greens.

I have started to use a benchmark to find out if a player is a fast trainer by adding a new position or Special Ability and run 6 Fast counter attack drills. If they are fast trainers, they shall get 1+ every 4th drill.
I 've wrote (here or in the other thread about new-old version training), about that test.
Drills wich give condition loss of about -18, must give +1 to new role or sa.
But one training isn't enough.
Remember the ( progress) blue bar of the old version which is hidden now.
Four training can give us some conclusion.
Can't you do one for Academy Players, topic: Roberto Rossellini?
hm, I was thinking "The Natural" with Roberd Redford, but I don't have many examples.
I had only one academy player so far.