A player that knows that they have the level to play the champions league, seeks out a club qualified for it to show themselves
A player that doesnt would rather farm in a lower tier league instead of going to a champions league team and not even reaching mediocre status there
(VCT is champions, GC is lower tier league)
Furthermore, this years challengers showed that if anything, Americas has TOO many good duelists and some of them will have to learn other roles to have a chance in franchising like Tex, so there are a lot of better options than florescent that probably might not even get a team
Hope that helped but i can keep finding analogies to explain it to the people of VLR if you like :)