MS was a fine HC, sometimes people forget he took over a team that was 8-8 the year before and did not make the play-offs.
He was smart enough to know that he had a good core of "better than most" and "great players" to build with and IMHO tried to add to that core of players by using free agecy, trades, and trying to "hit" on players in the draft that could immediately help the team.
Did it work?, MS did have a pretty good W-L record, but also made some bad decisions which probably did cost The Packers a chance at "at least one more SB run".
I don't think it was MS's idea to become both HC and GM, he was offered the posiition, what HC in his right mind was going to turn it down?
The GM/HC experiment that happened in the mid-late 90's turned out in most cases to not work anywhere. IE...Mike Holmgren in Seattle.
TT's philosphy is completely different than MS's was, is it better?, only time will tell, at this point MS's W-L record for the first 4 years is better than TT's, IMHO the patience of a good % of Packer fans is going to wear thin real fast if the rest of this season does not go well.
I was addicted to The Hokey Pokey, but I turned myself around!