Genie Scout: Player not able to reach potential

Hi, I have a 20 year old CB with a potential of 194 and a current CA of 144.

However, when I click on 'Show potential attributes', his attributes don't rise that much, and at the bottom, it says his current CA (when showing 'potential attributes' - so basically his max CA) is only 160.

So it says his PA is 194, but when I click 'potential attributes' it says his CA can only potentially reach 160.

This guy first appeared on my game at 15, but because of his age, I couldn't get him until 18, so he stagnated a bit during his first 3 years of development, as I couldn't train him.
However, since I've had him, he's developed well, (from about 108 to 144 in 2 years) and he hasn't suffered any major injuries.
Is it possible that because he didn't develop much during his first few years of development, he may be unable to reach his potential? Or could this just be an error?

There are players older than my CB with a lower CA and a similar PA who are still able to reach their potential, so I don't see why my CB wouldn't be able to reach his full potential (?)

Any help would be much appreciated.

I've just seen that his ambition and professionalism have dropped to 1 after signing a new contract - is there any way to get this back up?