They're pivoting to double duelist, and beyn perma initiator forcing free1ng and flashback to pivot to sentinel. So they think Estrella is better since Estrella did play a bit senti and can flex plus igl so he can help mako as well.
They said multiple times in interviews why. Double duelist was something they always wanted to try but didn’t want to risk it since kickoff means every game matters. They said it fits their playstyle much better because these group of players like to aim duel and be aggressive. Also, flashback likes the duelist role the most out of every other role.
I'm not saying it's bad, I just saying switching all their comps in only 4 weeks after Bangkok and player change mid-season is a bit hasty. I would prefer them to do it in increments not so suddenly like this. You kinda feel sorry for Beyn, cuz he did play well but it'll be hard for him to find a team in the near future.
Internally, the team practiced a lot with Double Duelist, and the history doesn't matter because there are four new players with a different IGL.
However, the playstyle is not a drastic change, and simply switching comps is fairly common across VCT during the early stages of Stage 1 (also since DRX is already somewhat safe in getting to playoffs, its a good time for them to make any changes if anything)
for people aside from DRX fans who watches the korean interviews, i guess it can be seen as a drastic change, but it isnt.