We need Henderson here next season, keep De Gea at least one more year, it can benefit them both, either De Gea steps up when he for the first time in years, have someone that actually can take his spot, if not he will be a great mentor and Henderson can grow even more by learning some things from De Gea. Win win situation for us, and if Henderson really takes the spot can keep up with his form even in a big club with all the pressure etc that comes with it, then it's time to say a big thank you and good bye to David next summer.