for me at level 5, the best 19yo fast trainers are between $5-6M.
So if I had your 19yo at $2.52M, he would be somewhere in the middle or a medium trainer.
Go to the transfer market and organize based on age.
You will see that my 19yo in the list are between $3-5M. If I wanted the faster trainer I would go for the one worth $4.98M, but even then he is not the fastest trainer as they will be over $5M, closer to $6M.
If you want the fastest trainers, go with the most expensive. 100% of the time.
And BTW, my market SUCKS. Hardly ANY 4/5 *!!!!!!