For casual cycling fans or people outside cycling, I think there's a good chance Ghirmay is already more known than any name of that list bar Ewan and possibly Matthews due to his historical achievement in GW.
I have a couple of friends who don't follow cycling that much and were aware of who he was after GW. They don't know who are Haig, Woods, Impey, Lutsenko, etc.
For marketing value, he sells a lot more than most of cyclists now. I would only rank Ewan higher and on certain markets. In broader Europe, in my analysis, I think Ghirmay image is more marketable than Ewan's.