This bit doesn't gel, and I don't understand at all where your logic comes from ?
If Stoner can get on any bike and win, which he appears to be doing ATM, and others can't do that eg. Rossi and his change to Ducati, then surely Stoner is the more "generic rider" and as such one would assume any bike designed to be ridden fast by him should be a fast bike.
Mind you I think all this talk of "best developer" is a load of hoohickey that is just another grab at some leftover cred. for Rossi to ctry and claim some possible cred for even Lorenzo's WC
. Its a ridiculous point to propose that any rider is out there racing and developing a bike so his competitor or even team mate can be as fast as he. Why do all the riders have "their settings" otherwise?
But nonetheless it is looking like Stoner is a better "developer" than Rossi as well. ie when Stoner went to Ducati it suddenly became the fastest bike out there, when Rossi went to Duc. it is apparently now the slowest beast on the grid