That team also had very good depth and no problem winning without Crosby whenever he was sitting out
That version of the Pens when they won an impressive 55% of their game in 2008 without Crosby, Malkin in those scored at a 130 points pace, in the 2008 nhl, that not necessarily a proof of great dept, than having Malkin scoring at a 56 goals -130 pts pace delivering.
Once Hossa get there is not that bad at all obviously but he was not there in 2009, in the 2009 playoff run the 5 forward with the most minutes after Malkin-Crosby:
J.Staal,
Guerin (38 years old)
Kunitz
Talbot
Cooke
Hard to imagine how badly things would go for a team spending to the max to have more bare supporting cast than that. Penguins scored 79 goals, Malkin-Crosby had 67 points. Old Fedotenko could help, Craig Adams, etc... they were not bad complementary low budget piece (obviously they won the cup, saying otherwise would be going against strong evidence) and they even matched well with the stars as it will become even cleared with time, but for a cup winner that would be on the lowest end.
Penguins scored 50 5v5 goals that post season, one of those 2 was on the ice for like 38 of those.
After Gonchar it was Scuderi-Orpik-Gill then young Letang and Mark Eaton.
Fleury is not bad, but can be quite shaky by time, .908 save percentage.