Isn't he playing that position already?
Just because they put him as a ten in the pre match line up doesn't mean that's where he's playing. Most of the time is playing as an advanced 8 in that inside left channel which is - dundundun - where you want to move him to?
It's more about starting position really - there have been games this season (albeit not many) where we have played a genuine 433 (or at least games where we have switched to it).
Without the ball we defend as a 442 most of the time, which I have no problem with, plenty of teams do.
With the ball, if you're in a 4411, then
KDH is receiving the ball that little bit further forward and he's not as involved in playing through midfield. It also makes us a tiny bit more imbalanced as his natural bias to the left of the pitch isn't replicated by anyone on the right. In a 433, that's addressed slightly better.
In a 433 he can get a bit more involved and a slighter deeper starting position is more difficult to pick up with his runs into the box. That said, a 4411 makes it easier to transition into our defensive shape without the ball. There are advantages to both. I'm a huge fan of the player and I maintain he's doing a good job as the 10 most of the time, I just think you get even more from him when the shape allows him to be slightly more involved. I think the argument for it increases if/when
Grealish returns as they combine so well.