Raja is one those people who garnered far more attention than he actually deserved, courtesy of AMD, which elevated his public profile, which I think was probably a mistake as Koduri's head swelled accordingly. If it was up to Raja, AMD might never have gotten past Vega in some form or other. As it is, AMD's GPU products and ambitions have skyrocketed since he left, which says a lot. BTW, AMD's newest mobile gaming chips will use RDNA3, which lets Vega out. You have to recall that AMD is only now getting serious about the laptop segments of the markets, and Vega is already dead in the desktop discrete markets. I think that singling out "rock stars" of the hardware biz is a big mistake, just as when Jim Keller left AMD and went to work for Intel for a brief period, I saw Intel fans boasting as to how Keller's presence would see Intel catching up with AMD soon--but that was before Keller left Intel after a brief employment. IIRC, Keller said he couldn't get Intel to listen to him, so he left...
But the main thing to take away is that successful CPU and GPU hardware designs are 100% collaborative efforts involving hundreds of people, or more, and sometimes a narrow vision near the top can restrict or setback everything. While Keller rarely if ever flaunted himself that I saw, Raja seemed to bask in the attention. I don't recall AMD giving Raja a hard time when he left...with Polaris and Vega, and with the Mantle API, Raja had pretty much given AMD everything he had. Hardware rock stars rarely meet their billings, which is reason enough to avoid creating them.