If there's money left over after signing a RW, LB, CB and a Pogba replacement (or extending Pogba, either way it's expensive) to ensure Bruno isn't our only creative central midfield player than fine, sign Kane. But that's probably 200M away and even more if the RW is Sancho.
Greenwood and Martial are just more likely to give us equal to or better play than Kane as a 9, than the options at those others positions are to outperform 40-50M signings at those spots.
Greenwood was one of the top 2-3 goals per minutes players this year in the Prem for a while, not sure where he finished, and Martial scored the same number of goals as Kane in 100 less minutes.
And that's assuming Kane doesn't decline further with injury stuff. Just seems like it makes more sense for other clubs than it does for us. We don't need to be in an insane hurry.
Kane to Juve or Madrid then to Newcastle in 2 years, imo.