Paradoxically, Bos in the TdF could be good for Cav's chances of green- provided of course that Cav finishes in front of Bos in the sprints!
The main reason for Cav not winning green last year, even considering his penalty, was that there were no other fast men taking points off Hushovd on the flat stages. Farrar was the only other guy up there consistently while Boonen, Freire, Ciolek etc were having a mare. Thor was consistently finishing second or third, not loosing too many points, then making them all back again on days when Cav finished with none.
What would Bos do in the sprints if knew he didn't have the beating of Cav but was faster than Thor? Would he have to sit up to let Hushovd by? Could be an interesting problem for Cervelo?
Haussler, on the other hand wasn't really that conspicuous in the sprints last year, but I agree that could change if the focus is not on Sastre.