You missed the point. The profit was made by old man Glazer’s investment, not his sons.The Glazers may know fuck all about football but I wish I was as "stupid" as them in a business sense, sitting on a clear $6bn+ profit - including the dividends already taken - if they want to sell the whole lot at the price Ratcliffe is paying.
If Ratcliffe is intent on full control the only US shareholders worth working on are the ones holding 51% of the voting rights, the Glazers.