Right now, I would say that's fairly obvious. As a general statement though, I disagree. Cleary is streaky like Franzen, but he was still second on the team in goals last year. I have said in other threads I would prefer Filppula on Datsyuk's wing -- at least until Cleary gets healthy -- because I do think that is affecting Cleary quite a bit so far.
Cleary has 141 goals in 760 NHL games (100 goals in 431 games as a Red Wing), which makes him a poor goalscorer. He is not a good top6 player. Datsyuk deserves to play with better wingers. Simple as that.