So despite spending around 60M so far, salaries stayed put. That may be part of the explanation. Last year we almost didn't spend anything. This also may have to do with it. Count in the record income from last season - I can understand him spending 60M.
But 90/100M total... it just doesn't make sense IMO. If this happens, it's a strong sign Pogba will be sold in 2016, and they will split spending the money (actually committing to spend the money) in 2 seasons.
The idea of cashing in on Pogba for silly offers will always be there. An active summer for sure with quite a bit of spending, but why is it you keep rounding up the numbers in your calculations?
by that list for net spent to hit 100mil region, it will take another 56mil of spending on new players.