I think most would just agree your point is just wrong.
On paper, without actually thinking, most would probably agree with you. But when you actually put some thought into it and break it down, it's actually very debatable.
I mean, how dominant did Crosby look in the Finals matched up against Zetterberg and Datsyuk? Hossa was Pitts best player in that series, not Crosby.
Another thing to think about is chemistry. We already know without any question that Datsyuk and Zetterberg are near or at the top in terms of chemistry between two players. Maybe only the Sedin's have more. And by the looks of things, Hossa doesn't have any problem playing with Datsyuk either.
As great as Ovechkin and Crosby are individually, there's no guarentee that they'd make the best linemates. Gretzky and Hull were amazing talents, but together they never made the best line.
With Datsyuk-Zetterberg-Hossa you have 3 of the Top-5 2-way players in the game today. Easily 3 of the best backcheckers in the game and all among Detroit's best PKers.
I don't think there's any question that the defensive game of Detroit's 3 would disrupt the offensive game of an Ovechkin-Crosby-Iginla line.