When you watch him play it is clear what he does and that he does create chances, the fact that he is not the last player to play a pass to the goal scorer does not mean his earlier passes weren't what actually created the chance.
Plus for most of last season when he played he was forced to play so deep because nobody else could move the ball through the midfield that he was not in position to be able to score/assist. Anytime he has been played in a role that he is close to Son and Kane those 3 have worked well together to create chances. He is by far the best player in terms of working with those two and at worst our second best passer on the team, a guy that can beat the press through dribbling or passing and someone who can make passes in tight areas, make passes that beat defenders and make passes to put teammates in dangerous areas.
We absolutely need him back, although Jose likely wastes him on the bench anyways so it likely doesn't matter.