Not really - most on this board agree that Todd, Zura, Friedel and Neill are quality players (and Gray can be on his day), so it's a matter of defensive mistakes and poor communication that have led to the goals conceded this year.
Bellamy on the other hand is upfront on his own with little support from the midfield - Reid and Savage couldn't hit a defence splitting pass if their lives depended on it, they also don't score any goals (3 between them is it?). Ped has weighed in with a few pearlers, but otherwise he's been non-existant. I also think few would argue Dickov and Kuqi are utter sh!te in terms of quality - their workrate is good, but that doesn't really help Bellamy besides allowing him to rest a little whilst they defend from the front.
Not that I'm arguing Nelsen isn't a quality player, because he quite clearly is. However, our best player this season has clearly been Bellamy. I just don't see how you can argue that fact.