Not sure I agree with that.
Some of the players brought in were palpably awful before they arrived- McCarthy seemed to be rated on one youtube video of him passing it sideways with slightly more urgency than he does now vs United - and I would include Kone, McGeady, Cleverley in that group of miscreants. I would imagine all four will be moved on within two years and none of them become integral to the side or squad when the season starts. Robles will be third choice for as long as he wants to stay but he's done too.
Many of the others are top players brought low by significant mismanagement. baines and Coleman look to be improving again, Mirallas another. All three will be transformed by having two effective centre mids brought in. Maybe even Barry will get a new lease of life when McCarthy is shipped out.