Thanks for replying- Actually I was hopping for some answers like "Yeah a had a MR and I was using him a lot as AMR when playing V" or "I had a DR but when I wanted to change my defense to 3 DC, I was using him with no problem".
As Cat said if I add MC to this player (and after 3-4 years pumping) there gonna be a bidding war
but if he has only DMC pos. and with a crazy Value, maybe it will be difficult to sell him.

So it be, "DMC-MC".
The gaining points must be divided to both 3 categories (attack/defense/M&P) I guess, because both are useful for these positions.