I mean, by the same virtue, Scotty Bowman almost exclusively coached elite teams. The 70's Habs, early 90's Penguins, and late 90's Red Wings are among the best ever. But there was a period, after his Buffalo stint, where all he did was work on HNIC. The question is: How much does a coach impact a great team, and vice versa. Is there a correlation? Does it lead to causation? I'm inclined Babcock is the best coach in the league regardless.
Additionally, the 2009 Red Wings were extremely injured in the finals. Lidstrom had been speared in the groin by Kane in the previous round, Hossa had a bad shoulder, Datsyuk was in and out. This left Zetterberg to play against Crosby and Malkin, the latter of which tore us up.