Just look at KC GC VS G2 GOZEN (includes both GC and T1 pros) so you can tell the skill level gap.
I'm not being a hater I'm just pointing out both of them are different leagues.
? if you say that the skill gap between GC and tier 1 is large, why would a gender bender try to enter tier 1 (and might end up in tier 2) if they can be more financially secure playing GC, even at a lower skill level than tier 1 players?