If we were to bring in some best in class coaches it would dramatically impact the team. Could you seriously imagine Ole having some outstanding coaches of much higher pedigree than himself and ignoring their potential to improve his side and his results? The question for me in that scenario, is whether Ole would feel comfortable/pressured having that kind of a setup where it's not people he knows already, and mainly younger and less experienced.
Seems pretty obvious that we need to address the coaching setup, and I'm not thereby saying Carrick or McKenna need to go, not at all. I'd keep them on, but add some bona fide top coaches, addressing our set pieces (especially defensive set pieces, and throw-ins), our tempo and ability in the final third, and really challenging our players. And, where needed, challenging Ole's ideas because he would benefit from it. SAF kept learning and challenged himself by freshening up his coaching staff.