Crashies has been performing really well. If he is not fragging, his usage impacts rounds a lot. And he usually frags well. In any case, a roster move at this point might just disturb the current team synergy. Despite their lackluster Kickoff performance, this 5-stack came back into form to dominate EMEA and (potentially) enter the next international grand-finals with a solid run.
The situation depends on how willing Leo is to play immediately, I guess? Boaster has been giving statements like "I don't know how much longer I have" or stuff similar to that effect lately, so there is a non-zero chance of a major structure change in FNC next season. Maybe Boaster retires (hopefully after a great performance in Paris as well), Crashies gets a good offer from another team and FNC rebuilds around the remaining core players.