I actually thought at the time it was a great sub, not only it would disrupt Everton's play, and he is more familiar as a Cm than Valencia, our biggest problem in the Second half was Blind was man marked by Naismith, and Valencia who is not used to play CM unlike Herrera, what Herrera does brilliantly is when Blind is man marked, he gets the ball of Cb's and act as a play maker, which Valencia was failing to do although he was great defensively, hence it allowed Rojo and Mclair to pump long balls or play difficult balls which disrupted our momentum and we didn't create much chances in the 2nd half.
I thought Fellani will do that and he started by playing one two's off Center backs, and i was beginning to get happy and understand the change, but then i don't know what happened but he went far too forward which left Blind so exposed, atleast with Valencia we were solid defensively, and i don't even remember him getting close to their any player, for a player who is brought to disrupt their play and get tackles in, he was awful. Blind on the other hand, people think he is a soft player, is usually in the thick of things, and he is an exceptionally intelligent footballer always on the end of sweeping away balls and getting in challenges, it just shows you don't need a big frame, players who are half his size but with intelligence can do far much.