So on that basis McClaren would have been in the running for you post-Boro? He ticked almost all those boxes.
He had a Carling Cup post-Boro. That doesn't make it, IMO.
I said an European League cup (or yesterday I mentioned to have qualified a midtable club regularily for UCL) in addition to other trophies like FA Cup or maybe a league title in some smaller league. Even then, he won't be comparable with Pep and Mourinho, but him being Giggs should compensate for that. McLaren wasn't Giggs of course, so in order for him to get the job in merit, eh should have had a similar CV to top managers.
If we divide managers in a few scales (not counting oldies like LVG, Wenger, Trappatoni etc, for obvious reasons):
- Level 1: Pep, Mourinho, Ancelotti, Simeone, Klopp
- Level 2: Enrique, Conte, Pellegrini, Benitez
- Level 3: Garcia, Emery, Blanc, De Bour, Tuchel, Moyes, Mazzari, Spalleti, Prandelli, Pochetino, Martinez
- Level 4: Bruce, McLaren, Allardyce, Pullis, O'Neal and the European counterparts (i.e mediocre managers from all the leagues)
Then in my opinion, Giggs should get the job only if his achievements are comparable with at-least upper half of level 3 managers (i.e the first four), but preferably with those in level 2. I don't expect him to be a level 1 manager in order to get the job, but currently he isn't even level 4 manager. He should at least surpass the likes of typical mediocre managers in England, and some bright young ones in level 3, to be considered.
Obvoiously, that list on levels is totally arbitrary and most likely I have forgot some managers that should be in second and third tier. You can make an another list.