McLeish came straight in as player/manager after McLean, wasn't a Mclean signing. Doesn't change the fact he was a walking fucking disaster.
As fir those prmoted from within, Davies done OK but he had Boyle's money behind him at the time, and Malpas was shocking.
Promoting from within is OK if you're already a successful team (or with no danger of being relegated), with a bit of money to spend.
At a club like ours with no money and such a young team, it's asking for trouble