Crazen is low to mid-tier, he was good at the game but he got exiled pretty quickly, however it was really funny that Testicle Technical49 had to cancel decoing his layout of Everybody Do The Flop megacollab (which was one of his most popular videos on his channel kek) because Crazen made one part of gameplay of it and he was too much of a bitch to just get someone else to replace his part.
Advy is probably S tier solely because of how his cancellation attempt had little to no effect on him, despite becoming a pariah in the English-speaking GD community and getting all of his megacollabs removed from his account, his legion of ESL toddler fans managed to keep him not only relevant, but still the second most subscribed GD YouTuber on the website (behind some SNCA Shorts 'slop maker but who cares lol)