This is probably the biggest roster change in CS:GO history. The French shuffles are up there (especially the Happy/shox/smithzz/nbk/kio shuffle) but other than that this has to be it purely because of how long the core fnatic members were together + how successful they were. As a big fnatic fan since maybe 2012? I never really thought this would ever happen lol. I suppose it's not too surprising especially given how disappointing their results must have been for the team itself (winning 4 pistol rounds in the semis vs. Liquid at the major but still dropping two maps is unacceptable for a team of fnatic's caliber).
On paper though, this move is definitely a downgrade for both sides I feel, discounting personal issues/whatever that has made it impossible for them to work together. New fnatic is going to be relying on olof and dennis even more so. Skill-wise, I don't think wenton is a tier 1 player, and Lekr0 isn't either although I do think he has the potential to become one. twist is really talented but he hasn't been playing against top-level opponents for a while. It'll be interesting to see him be able to play against the best teams more frequently now that he's on fnatic so I'm looking forward to that!
Krimz moving to GODSENT is probably the most surprising especially as everyone always dubbed him as olof's duo. A lot of ppl don't remember that this GODSENT lineup was the exact same fnatic lineup back in early 2013 where they were not so good except with -krimz +devilwalk. krimz is a lot better than devilwalk so obviously this team will be better than that one, but I wouldn't be surprised if they struggled at first (and I don't see them challenging for the top honors). That said I think they'll have an advantage over olof's team in that all of these guys are established players who know what they're doing. I'm just not convinced their ceiling is as high as the previous fnatic lineup though.
On a side note, I'm sorta surprised fnatic stuck with olof's team. I guess he's the face of the team, but I always felt that the core fnatic team was the original members of JW and flusha. If someone told me fnatic would break apart before NiP, well, I would've found that hard to believe. It's the end of an era but I'm excited to see how this is going to shake things up in the scene!