well yes, academy player (the expensive one) usually is a fast trainer.
As the market is the latest months, it's good idea i think to sign an academy player (of 80%).
I would do that but didn't have the chance as I didn't have the positions I wanted or it was after the 1st week when my team was ready.

You can read this thread, has some good examples about academy players
https://forum.topeleven.com/tutorial...e-help-me.html