I'm confused by what I've been reading. It seems that Mermaids concerns do not appear to be the same as the CC's concerns, which also do not appear to be the same as the gender critical concerns. We are concerned about safeguarding vulnerable children and gaslighting institutions, the CC are concerned about the charity's governance and reporting processes, Mermaids are concerned about trans inclusion and their leadership not being trans enough.
So SG could be replaced with somebody even more extreme, the CC could enforce proper procedures at Mermaids, which Mermaids would comply with while continuing to promote harmful procedures to children and issue incorrect guidance to institutions.