He is sorely needed at the back. Blind is very good against lesser opponents, but we need someone who is faster, more athletic and stronger than Blind in these matches. Hangeland, in the Norwegian studio, said Blind could do two things for the first goal - either attack the ball or follow the run, but he did neither.
Also, if we want to continue with a two man midfield, we need our defense to sit high up the pitch. With Smalling and Bailly in the centre and Shaw and Valencia on the sides, we can afford to sit plenty high, but with Blind the fast players will target him time and time again.