Spot on. His fellow attackers must not leave him isolated. I can see him work with any combination of Mount/CHO/Werner/Puli but less so with Ziyech... we will see.
Anyway, if he really can make this false 9 position his own and we manage to make this system work vs any kind of opposition, our long term striker problems could be solved. Far to early to say after one match tho.
One final thought, I noticed how he takes a split second to compose himself everytime right before finishing when in on goal.(Obviously only when taking a touch prior to finishing so not for volleys or headers) Look at his hattrick in the cup, his offside "handball" goal vs Everton and his goals for leverkusen the on vs Inter for example. At first i thought it was infuriatingly casual to delay the finishing but it is incredibly smart. He recognizes when he has time to readjust his body, only delays if he actually has the time and thus picks the perfect moment to strike. This is an attirbute i have seldom seen in such a young player. A quality of top class finishers. Off the top of my head, the only other players I have consciouly seen doing this as frequently and ostentatively are Lampard and Messi, two of the greatest finishers in football history.