De Gea doesnt inspire any confidence from our defence. I dont think it is complete coincidence that all the defenders we buy seem to decline and suddenly become shit. The common factor has been the goalkeeper, who is well known for not being particularly vocal or commanding.
De Gea was always a fantastic shot stopper - he made saves that he had no right to make, and won us points single handedly as a result. However aside from this, the other facets of his game have always been lacklustre. Unfortunately, it seems that De Gea's reactions and shot stopping ability has either declined, or for whatever reason is no longer enough to get us through matches.
In the few games where we saw Henderson, I thought it was obvious how much more confidence he appeared to give the defenders. He was more vocal, more commanding, more dominating (not to mention better distribution and better at rushing out). These are traits that are required for a GK for a top side, and unfortunately De Gea has been unable to acquire them.
It is time to give Henderson a chance. We may concede the occasional goal where we think "De Gea may have saved that", but we will arguably concede far fewer goals thanks to improved communication and confidence among our back line.