On the point about Rooney @ChrisNUFC, if he worked hard to stay fit - that fits the definition of the attribute. It's how well a player stays fit during injuries and when they don't train - and for "train" I'd say that is in-game training, not what happens "off camera", as it were.
It doesn't really matter if Player A has to "work" at it each day or if Player B rocks up at pre-season training in shape without much effort - it may serve the same purpose game-wise.
Re: Aarons as one of the players with 30+ "growth", he may have that high a PA, but given his age, the most he will likely reach is in the 140s anyway. The fixed PA will have been set from where he was at 21, and in all likelihood, he hasn't continued to develop at the original rate. Same with Lamptey as well. His CA is underpinned by some of his physical attributes, like acceleration. So even if he were to improve in mental areas of his game, it's unlikely he would also maintain that acceleration into his mid-to-late 20s anyway.