Once you have decided that you need/want a new position/SA for yr player, then all point allocation should go to that first, after all tht special allocation is completed, then you concentrate on skills.

Consider tht for SA, you have to make sure that yr player is already quite decent at wht he does (FK, CK, assists etc) before you choose a SA. If you simply give him an SA, it doesnt mean he will excel with that SA.