The thing with Henderson is we have no idea how he'll handle the pressure at United. A few people who have coached him speak very highly of his mentality but until it's tested you just don't know.
Personally, if De Gea was able to find a move I wouldn't stand in his way as we have before but he would have to face the prospect of taking a significant pay cut wherever he goes. I reckon there is a good chance of Oblak to Chelsea and De Gea back to Atletico. From Atletico's perspective, they would possibly get £70-80m for Oblak and would maybe get De Gea for £50m leaving them a chunk of change to strengthen elsewhere. Would PSG be interested in him with Keylor Navas there? Would be kinda funny if Navas had to worry about De Gea being signed again.
Henderson as no1 with Romero in case Henderson struggles could be an option for us.
Edging towards Brexit FC though with a potential back five of Henderson, AWB, Tuanzebe, Maguire, Shaw, and a front three of Sancho, Greenwood, Rashford.