I think it's unfair to blame Senderos for the second goal. Sigurdsson should be credited for a great bit of skill. Why isn't Hughes getting blamed for leaving Defoe completely unmarked? The third goal is certainly his fault though. I think it's clear he isn't consistent enough to be a regular fixture, a new centre back is a must.
If anything good could come from this game it would be that Mo will happily get his cheque book out, our weaknesses were there to see. We rely on Ruiz, without him we are blunted. We need cover for him. We also need a partner for Diarra and a good centre back.