a 20 ID guy would cost a lot to have. And if his salary was to be rather low it would be at the cost of all the other skills. One with 15 ID and then higher in the other skills to will be a lot more effective player. Unless you just want one that can defend. Since the GE works on matchups of player vs player the 10 ID player would be the weak link in the defense. and if he gets more matchups against him then the 20 ID player it may lead to you losing the game. If you set up a 15-15 ID defense you wont stop em as well as with a 20 ID guy. But the all around performance in defense will be better.