The club had to make a statement signing that summer because they knew Kane was leaving. Maddison took Kane's shirt number and near enough his salary.
That has nothing to do with the previous point, that implied we worry about other players wanting parity.
The wage structure and salaries have and do increase. We aren't going to do a United and start paying £40k per week players £200k for the sake of it.
Consider that even we don't go that silly, but end up with the likes of Reguilion, Ndombele, Gil, Doherty, Aurier etc stuck here because we paid them more than other clubs would.