Right now NFL is basically on his own & taking all flak, when all the fault lines are PL sanctioned if not designed.
Eddie howe! a novice who did not do so well in his short term at burnley & was sacked by bournemouth! Mowbray was also english championship promotion end quality! but was destroyed trying to manage Celtic. Next season someone like him poss, but a massive risk right now.
More realistic chance of turning this season around by providing NFL (a proven past winner) with assistant(s) of his own choice.
Even having WGS imposed alongside could work, sure b no worse than Pistols current assembled, seated 3 meters apart come matchday.
WGS is logically a very likely addition, PL's buddy & NFL would b able 2 keep his pride & say it was the plan, just like he knew to do with the arrival of (sacked by west brom) nicky hammond, like JK & WGS jr, not a single one being a NFL choice. (yet he gets all flak)
NFL & WGS & 3 quality signings (Forster or similar & 2 core defensive midfielders would win 10IAR for Celtic.