Sommer's knees went on him in the end and unfortunately at that stage he was a shell of the quality player that he was for his whole career up to that point. But, I agree, Brown was really good - when he could stay healthy. I also think Ian Feuer was just as good as Brown and Sommer (in his better days), but it seems like he's pretty overlooked.
Feuer was better at Colorado than NE in my opinion, but he also didn't make the best XI ballot by my games played qualifier (since he played less than 30 games for the team) or major award won qualifier.