Whether it's the bike or the rider is nothing but your opinion (certainly not impartial cause you can't stand Rossi) and speculation. Keep digging buddy, results count more than hearsay, speculation and opinions.
Talps, as I've explained to you innumerable times, far from disliking Rossi, it's the obsessional near fanatical fan base and associated hype that I 'can't stand'. Regarding both 'bike and rider' I am impartial and have no affiliation or emotional investment, although I'd love to see Cal, Brad or Scott do well. And no, they're not as talented as Valentino Rossi, but as results stand, if they benefitted from the level of preferential treatment that Rossi has received throughout his career I'm highly confident that they would improve.
And regarding results, you seem insistent that a rider should be judged solely upon them irrespective of the circumstances and the package availed to they and their teams. Thereby the season of Loris Baz should unquestionably be compared to the season of Valentino Rossi purely on his race finishes and his championship standing - because ultimately, that is how we measure and equate the 'greatness' and superiority of one rider over another? Perhaps if you are that myopic.
Given your argument, then yes, the two years at Ducati suddenly become hugely significant...because overnight Valentino Rossi's results were ...... Much like his predecessors, Nicky Hayden had practically no feedback whatsoever in the direction of that motorcycle. The endemic philosophy at Ducati even prompted Valentino upon his arrival to suggest that it was worse than HRC in terms of the stubborn belief in the primacy of engineering over the rider which was one of the contributory factors behind his defection to Yamaha. However, it wasn't long until the Valentino effect came into full force - and although Ducati had long since abandoned the trellis frame, they compromised their entire race DNA ditching the CF chassis for the aluminium twin spar largely at Rossi's behest. Quite different to banishing Marco Melandri to a Sports psychologist.
Records will always continue to tumble as a sport evolves and unlike the hordes of biased Rossi devotees I am always reluctant to compare sportsmen and athletes from different eras. If we base this purely on results as you suggest, then I'm afraid that Rossi is not the 'GOAT' Ago is, but I wouldn't subscribe to that either. If we equate it in terms of a long illustrious and competitive reign at the pinnacle of the sport, then yes without doubt Valentino Rossi is unchallenged; but this is intrinsically political and that very hegemony, that dominance owes as much to the marketing man, those that buy into it and the sustained, exponential and perpetuated disproportionate allocation of resources as it does talent.
EDIT: I would also add that in terms of that 'illustrious career', while Micheal Laverty was hysterically blithering on twitter about unwritten rules his brother simply posted this well known and highly poignant quote by Warren Buffett:
"It takes twenty years to build a reputation and five minutes to ruin it". Indeed.