Numpty >>
monday december 9 - 17:20, Edited
monday december 9 - 17:28 Okay, if it's a case of getting the most out of him then, as @PMK has already said, I think the simple answer is to keep him as a DM.
It's not terribly cost-effective to change a player that's already been trained another way.
Looking at the numbers in more detail his Duelling is currently 3.97 which should equate to a base value of 81 Duelling and also 3.75 (=75) Tactics. For players over 21 there is a maximum limit of 10 position trainings, so if you did 10 then you would reduce Duelling to 31 and Tactics to 25 which you can retrain a little and then spend the rest of the xp on Passing. But he won't be as good an AM as he might have been because of the 'wasted' xp that's still on Duelling.
If you keep him as a DM then I would suggest making sure he has as much Duelling as possible, since their main job is to tackle. Since you're happy to do some position trainings then I would reclaim some the xp spent on Passing to train more Duelling.
In this game most players are best trained as specialists, and those with multiple skills are not great at anything. DMs need to be very good tacklers and do not have to be good passers.