Do MotoGP greats need to prove themselves on different bikes?

https://www.motorsportmagazine.com/opinion/motogp/do-motogp-greats-need-prove-themselves-different-bikes?amp#click=https://t.co/Hm0gkpGuJshttps://www.motorsportmagazine.com/opinion/motogp/do-motogp-greats-need-prove-themselves-different-bikes?amp#click=https://t.co/Hm0gkpGuJs https://msmproduction.s3-eu-west-1.amazonaws.com/s3fs-public/opinion/valentino-rossi-yamaha-header.jpg