I like him much better than Santos as well. But I think the coaches see Santos as having more potential to grow into the better player at the end of day as he has size and probably is a stronger on the ball (not that we saw that against Seville in the Supercup). Tiago is good already and his maturity and playing level is of a higher standard that Santos. He could be a starter on ten other first division clubs right now, however, maybe with his skillset he is not going to grow that much more onced his fully peaked compared to Santos.