Albert Hall,
The notion of there suddenly being viable work for 80-odd airframes is clearly nonsense. Covid-19 has seen to that, and many of the former FlyBe routes probably, as you have eloquently discussed, weren't viable except in the sense of keeping aircraft on expensive leases they couldn't get out of doing something.
If FlyBe 2.0 started up with more than 10 airframes I'd be amazed. I would reckon a figure of closer to 5 might prove to be the reality, and a very limited network centred around a single base - Birmingham European / Brymon Eurpoean / BEA / Maersk UK / Duo anyone? - that didn't end particularly prettily.