Agreed, and it goes further than just with Kulu i'd say, as Allegri(i believe?) a few years back once stated and was even rather laughed at because of it, Morata is one of those unique players that can actually play efficiently and adapt in any type of attacking role and/or formation aswell as regardless of the other partners characteristics/type.
Created the winning goal too, his run and then cutback to Rafia was inch perfect. Rafia flubbed his first kick at the ball, before turning and firing it home, so not sure if it counts as an assist, but should be one regardless as Alvaro did all the work.
That's because all he got were long balls from the back. It's impossible to win the header between 2/3 defenders, let alone control a ball and build an attack. There is a reason both him and Ronaldo were invisible.