It's a bit of a perfect storm for Allen currently, in that the players around him very much compliment his style of play. He has 3 main strengths:
1. His pressing out of possession
2. Pulling the opposition out of shape by getting into half spaces
3. Making runs beyond the striker and into the box
Gyokeres suits 3. because he pulls wide a lot and commits the fullback 1 on 1 which leaves the space for Allen to run into.
Our playing style see a lot of either a) countering quickly, which is good for his runs again or b) we ball carry from deep through Hamer and O'Hare which again suits his off the ball movement.
What we don't do is play a huge amount of slow build up possession football through midfield which I think would challenge his technique and physicality.
So in summary, now we've gone back to a variant of the box midfield, together with the other players we have in the side, it is maximising his strengths and minimising his weaknesses.