Kane is more clinical with his shots than anyone else on the team. Why wouldn't they score more goals with him back? He was scoring regularly before, and creating chances too.
Or are you just talking about a generic Kane replacement?
A generic Kane replacement. We weren't playing well when Kane was in the line-up so to think that another striker to replace Kane would make a net positive difference is just wrong. If anything, in theory, we would play even worse with a Kane replacement.