See, this is the kind of thing I mean when I worry that people are misjudging the type of goalkeeper Henderson is.
Is Henderson quicker to sweep off his line than De Gea? Obviously, though De Gea has actually improved quite a bit in that regard this season. Is Henderson generally a very good sweeper? Probably not. During his Sheffield United season he was bang on average for the league statistically and I haven't seen him do much this season in that regard beyond what you'd expect an average keeper to do.
So if the argument is that we're better able to play a high-line because Henderson is a better sweeper than De Gea, that's fine. But if people get it into their head that Henderson is quick to sweep by general standards then they'll be disappointed once they stop having De Gea to compare him to.
He seems to have figured out what the competition David De Gea doesn't do, and is working on them. That he is sweeping and trying to improve his overall influence in his box when that has probably never been his game is what you want to see, and that he hasn't been making too many mistakes despite trying to leave what has been his comfort zone is definitely a positive and shows he is capable.
Think his influence so far has been overstated by quite a few, but he is still a baby for a goalkeeper and comes across as a smart kid. He most likely recognizes what he needs to be doing, is working on them, and is putting himself to test on the pitch. He clearly isn't short of confidence, and has plenty of time to improve on what has to be improved.
In the short time he has been with our first team, he has shown that he is capable of claiming difficult crosses without flapping at them, sweeping against through balls without misjudging them, good old fashioned distribution, pretty vocal at the back, and already has plenty of credit for his shot-stopping at previous clubs.
Unless the flaps and misjudgements starts creeping in and becoming frequent which hasn't been the case in his more than a dozen caps, then what he needs is the club's backing and patience. Give him the gig full-time, and the more he keeps playing and the more secured his position is with the standards maintained, the more he will be willing to go for even more low percentage balls. He has shown that he is capable of being the complete package, and for a young lad, that is the most important thing.