He didn't really contest any in the Eneco Tour??
He won he Tour of Qatar, which had Bennati, Haussler, Bos, Boonen, Steegmans, and Hondo all in it.
Not the world's biggest race, but with those guys racing, it's not something to be ignored. He also generally has trained purely to be a lead out. He trains for long sustained efforts, instead of sprints. This will change next year, even if he ends up leading out Bos at some stage, he won't be training purely for it (with HTC his season revolves around leading out Cav, and if he gets to ride for himself, it's a bonus and not something he gets to build towards).
Eneco Tour is a ridiculous race to base anything on, Renshaw hasn't ridden since the TdF, and hasn't contested a sprint yet. Have you watched, or just read results??
Also watch the 2010 Tour of Denmark. Not as good a field as Qatar this year, but he and Goss were taking it in turns winning!