I don't actually see much evidence of Neil Lennon going into struggling clubs and turning them around.
Inherited good Celtic sides and a Hibs team that had just won the Scottish Cup and had a right good squad already.
Sacked in Cyprus for poor results. Ultimately left Hibs in eighth. His final season at Celtic was a big failure.
If anything, his track record is making good teams considerably worse.
This whole "he's a winner, won't take any shit in the dressing room". So was Barry Robson, so was Jim Goodwin, and so was Scott Brown as part of Glass' team.