This should be a good one to spend some tokens. I would agree with Beckstar that just go for 20 rounds, it is OK.

If you get it, train him with the third position and if you still have greens go for 7 or even 8 stars.

This is a defender which is really rare with such good combination, e.g., either feet, SA, high capability, and great age etc... And from my opinion, defender deserves more tokens, because they can always determine important games.