We're not in a position where Kane completes the puzzle. We're in a position where we need 4 quality players in various positions before we even begin to think about closing that gap on the top teams in the PL and Europe.
We sign Kane at that age and we're basically saying we fix one area for the next 2 seasons and blow most of our budget in one go, and yet we still haven't addressed the 2 x midfield hole, the RB, CB and GK issue.
But there's always next summer right? Wrong, Varane another year older, more knee issues, Casemiro another year older, Kane another year older, you get the picture. All of a sudden 3 seasons later we're back to needing a new defence and a new forward line all over again, and we're still wasting our entire budget on one 'good' player a summer and patching the rest together with whatever's available on a free.
Kane would be great if this was Fergie's last season but it's not, we need probably about 4 players who are willing to come in and work their arse off to prove they belong here. Then we can sign Kane next summer.