Its worth remembering if you are wanting to power train a player as well as add a SA or an additional position to the player to add the SA or position as soon as possible though.

If you decide to power train a special ability its a lot easier to do it to the player when they are 4/5 star than when they are 7/8 star due to the training speeds.

I gave my star player the one on one ability and decided against an additional position due to wanting an out of our striker. The first thing I did with him as an 18 yr old was add the SA before I started to train him for extra stars.