I am not sure what sort of legacy SJR thinks he will be leaving behind, if he is the one that allows the Glazers to hang around until after the US World cup and beyond then that is what he will be remembered for. It's an interesting take though, but I just don't see it.
I also don't see why SJR would want to be the one who does all the dirty work for the next 5-6 years to raise the value of the club for just 27 % of the return, or more likely still raise the cost of the remaining shares they want to buy themselves by a stupid amount.
It was always a crazy deal on paper for Ineos if they don't take full control in the near future. It's a bit like people who own shared ownership houses, why would they want to invest a load of money into their house until the own it outright, as anything they do to it before will only benefit the other shareholder alot more than them when it's sold, or cost them even more when they want to buy more shares.