Tiresome pedantry alert, but we can't blame Malcolm Allison for overspending on Keith MacRae, who was signed by Johnny Hart in October 1973 for a British record fee for a goalkeeper. Mal had walked out to join Palace at the end of March that year.
As for Alan Oakes, I'm a bit late to the party but his last season at Maine Road in 1975/6 was my first watching the senior side as a kid so I do remember him. But I think the best testimony to how good he was comes from Bill Shankly, who said that Oakes was:
That he earned such an endorsement from the manager of a rival team, and what's more a genuine legend in management, shows you how good Alan Oakes was and how lucky we were to have him for not far short of two decades.