I sometimes dont't like that celebrities advertise a project, they were usually paid to do so, and that does not reflect in the project itself, now if a celebrity advertise on its own, due to actually liking the project, then that is different, but any celebrity will do that, because they have a lot to gain by charging the project itself.
I think indeed the project has already enought competent people already. When i saw the curriculum of the team the first time i was very impressed.
There is no particular need to have anybody who is particularly more famous for one reason or another, imo.
They may have enough people to make the job. But they can always get more people to marketing.
Publicity is always for icos and the best way to get it find a famous person unfortunately.