I think its difficult to say tbh Chris. A lot will depend on how the bikes compare with each other. All things being equal, I think Rossi can still show all the others a clean pair of heels. I would never bet against him. Every time we think he is past his peak and starting to slide down the other side he pulls it out of the bag again.Yamaha may struggle a bit now they have lost his development skills ?
Honda - every season they show a lot of promise in testing, and then cant quite deliver when the racing starts, maybe this year will be different, who knows ?
Stoner - I dont think he has the consistency to win a string of titles tbh, and the last time he was on a Honda, he spent even more time on his arse than he did when he was with Ducati.
When he won the title, I think he had a huge speed advantage over the others. Cant deny though, that no-one else ever seemed to tame the beast like he did - sometimes.
It will be interesting to see what Rossi does with it, although it may take a bit of time for everything to gel. :-/