I understand that the devs are working to fix the GK training glitch which the managers are using to create the "mutants" but please don't do that
I 'm using this in the beginning of every season to do a massive power training for the new (10-12) players or those who lost a star.
I give them the GK training (including those for earning an extra position or sa) and then separate them to attackers-defenders or MC and give the relative drills.
It's saves me from a lot of time as it's very boring the extra training specially because the repeat training button is missing.
You know that we don't earn more greens from that.
You will do that for the top100 platinum managers mostly but it's not right to loose another one good feature because of that.

You could work on fixing the weird reactions of calculations when the system finds top % skills.

* and add a repeat button