It seems like he came in and tried to put his "mark" on the Reds. The mid tier players left in droves (Lucas, Lance, Harris) and we're left with zero Super experience in key positions. Now we're running around like headless chooks.
I'd be interested to know how much of this is Cordingley's doing and how much is Carmichael's. Carmichael had a marketer's approach to recruitment, he seemed to be more focused on big-name signings as a way to get bums on seats to try to turn around the QRU's financial situation - guys like JOC (James O'Connor), Goromaru, Karmichael Hunt.
JOC (James O'Connor) and Hunt in particular put a big dent in the salary cap and that in turn puts immense pressure on the mid-tier players you refer to. Particularly when those mid-tiers are worth pretty big money to other clubs like the Rebels and Force. The mid-tiers leave and then the Reds have to fill in the blanks with U20s who in general aren't ready for Super Rugby yet.
I firmly believe that a team of solid mid-tier players will in general beat a team that's got two superstars and then a bunch of novices. Even if the superstars are still in top form (and neither JOC (James O'Connor) nor Hunt were) they are still going to struggle in a poorly performing team.
So they went completely the wrong way about it IMO. Superstars are not a panacea. You need to get the fundamentals right, hang on to the dependable mid-tiers, sign exciting new talent (which the Reds are actually pretty good at doing) and keep it (which they are BAD at doing), and get good coaches and support staff in place.
Results will improve, morale will build. Success breeds success, and then you'll find the bums start returning to seats of their own accord.