Arguably a little. Zimmermann has no business with his hand where it was which gifts them a penno. Arrons encrouched (Though I think it was a poor and ridiculous call) and is also not close enough, doesn't snuff out the danger on his side of the area for the second goal. It could be argued that the pair of them cost us the game! Did they disappoint? actually not for me, 11 heroes out there, but these mistakes continue to undermine our chances of winning. Bah!
Perhaps disappoint was too strong a word, but I felt, rightly or wrongly, that he filled his position but added very little else. He also gave the ball away, breaking down moves, but he wasn't alone in that. Aarons and Zimmerman both lost points for their errors, but Aarons was the BBC MotM and no points are given for Zimmerman's reading of the game and ability to stifle attacks, often just through good positioning. For me, Trybull filled his role well enough, but very little of that made much impact on the game.