I mean that maybe it would benefit to put someone else on it too.
If the GP0 and 12 are radically different, it makes no sense to me to have Barbera, or Abraham, running on the 'obsolete' GP0 when they could also be on the GP12 offering further feedback from another rider's perspective. More is better in this context surely, particularly given the lack of progress so far? (Rossi's own words above) However, as I have no idea what the differences are between the 0 and 12, maybe anything fed back from the GP0 may be of use on the 12 - but I wouldn't have thought it.
As for Stoner being the only one to be able to ride a Ducati, yes, that is obviously true up to the GP11. Now it is a completely new bike, Stoner has never ridden it and it has the same chassis design as the rest, therefore that situation no longer prevails (except maybe in Rossi's mind) The GP12 is no longer a 'Ducati' in the traditional sense and has been developed so we are told, by the best development team in the business to be a bike anyone can ride. So, why would any other rider now shy away from it...
As far as where they are in relation to last year, it is difficult to tell. Two test sessions and two opposing views from Rossi with Sepang 2 virtually negating the view from Sepang 1 and sounding like last year all over again. Too much has changed too quickly, breaking the golden rule of development, one thing at a time, otherwise you have no constant upon which to evaluate results. It is hard to know if the new improved front end feel of the GP12 is down to the chassis or the new tyres. It would be interesting to know how it performed on last year's tyres as that would be a truer indication (I'd be surprised if Ducati haven't tried it) Having said that, ultimately it is about how the bike goes on this year's tyres but how can you know which has yielded the benefit - new chassis or tyres?
Finally, you do realise what you've said here don't you?
Do you not think it is fairly obvious that as there has only been one rider able to ride the Ducati anywhere near its best potential
You're actually admitting that Rossi got nowhere near the results that the GP11 was capable of?
I'm going for a lie down...