Actually no, it wouldn't matter, as Rossi would no doubt finish the race. Stoner was fast on it sure, but his most recent time on the Ducati was very inconsistent, the bike has a limit which is behind Honda and Yamaha significantly, Stoner found it and went over it more often than not.
I have my doubts on this. If it wouldnt matter, then why didnt Stoner get a Yamaha factory ride for 07 as Rossi's teammate? Thats what Stoner wanted. Only now people are wanting to see them on the same bike, but we were robbed of that in 07 by Rossi.
Therefore the only comparison we have is on the Ducati.
Rossi vs Stoner results/consistency:
Stoner 2010 results were - dnf, 5th, dnf, 4th, 5th, 3rd, 3rd, 3rd, 2nd, 3rd.
Rossi 2011 results are ---- 7th, 5th, 5th, 3rd, 5th, 6th, 4th, 6th, 9th, 6th.
Stoner looks consistent to me, 5 podiums in a row. Rossi has had one race crash that was luckily not a dnf. Stoner had two race crashes. Not much difference.
I think Valencia testing was the most direct comparison of the two we have seen to date. Stoner jumped off, next day Rossi jumped on. Same track conditions, same bike. The shoulder injury was a problem but it might not affect outright lap pace, its more a problem in terms of endurance over a lot of laps.
At the end of 2010 I was hoping Stoner would go well on the Honda but in all honesty I thought Rossi was going to top all time sheets in testing on the Duc, while Stoner was going to be slowest of the Repsol Hondas, or at least no match for Pedro, on a bike developed specifically for Pedro. Instead I would say Stoner is capable of going quicker than Pedro.
Against Rossi on the same bike? Maybe we'll never know?
After 2008 I would never write off Rossi, and after 2007 I wouldnt write off Ducati either. Both can pull a rabit out of a hat.