Just a little while ago 100T announced that Ryu would be moving to the assistant coaching position which left open the 100T midlaner positions which will now be officially filled by Huhi.
https://twitter.com/100Thieves/status/1065432904333852672
Edit: As several people have pointed out, Bang has followed multiple 100T players and their main account. So its more then likely that he is going to be the new starting ADC. This would most likely solidify the new 100T roster lineup to be:
TOP: Ssumday
JG: Anda
MID: Huhi
ADC: Bang
SUP: Aphromoo