Bro was their best player for the first half of the season and was putting up the best numbers for the team. Cyro was learning how to be a entry since previously zekken filled that role on Xset. Cryo settled in and became the best player but in no way was Asuna terrible. Theirs a lot of fingers that can be pointed around for 100 thieve failure but it's unfair to pin it all on Asuna.
This meta was hard for 100thieves with all the role swaps as well. Derrek didn't have a good year and the meta didn't really allow him to play agents he's great at, bang wasn't as dominant on smokes as he was in the past, Stellar didn't frag out as much either. Also losing Seangares was a big blow to the coach of 100thieves. His timeouts where great as were his strats. 100Thieves might make some drastic changes but getting rid of Asuna and Cyro probably shouldn't happen.