Of course there are young slow trainers but I agree with @Rebelsunited that there are two categories of ft.
I call them 1st and 2nd class. The 2nd class needs about a +20% of greens for the same progress.
A T academy can be both, most of the times the 14T is 1st and the 10 is 2nd.
In higher levels, I also have seen 1st and 2nd class
Example here
https://forum.topeleven.com/tutorial...ainers-58.html
#573
I don't agree with the example (pic) of @Rebelsunited in the point that from one only training (specially with this GK trick) we cannot be sure from that result.
We need at least 5-6 training results to be sure.