And Steve Jobs was running NeXT. And like NeXT, Brave doesn't really seem to be catching on...
From what I understand though, Eich has lost faith in Mozilla maintaining their own renderer, so if he came back to Mozilla it would probably coincide with Firefox becoming yet another chromium skin.
Mozilla is sticking with Gecko for now, and they do not need my faith to continue.
Brave is growing, has grown every month, not at over 5.5M MAU. I am not sure how to interpret "Brave doesn't seem to be catching on" as other than false. Firefox in 1H2004 was in a similar trendline. People then still said "IE for evar!"
I have no idea if Brave is going to succeed at their goals, but they are the only ones trying to comprehensively change the model...I wish them success!