I agree with most of the things you say, I'm gonna add some things here and also try to make what I ment more understandable.
1. I didn't mean Fnatic should change their roster right now. If they're starting to get figured out they should change. I didn't mean that time will come before Katowice as you may have thought I meant, I meant this time could come after Katowice, at this time they should consider changing sooner rather than later so they are well prepared for the 2nd major during 2019.
2. As JW said, Brollan joined right during the online season so they didn't get a chance to get pracc in before it. That's why you shouldn't judge from that, also, changing the roster or something like that because of bad Online results would be stupid. LAN is when it matters and right now Fnatic are delievering on LAN. With this top 4 in Chicago they are going to advance massively on the HLTV Ranking, which should help them get invites again. If they finish top 4 my prediction is they are gonna be between 8th and 12th in the world on Monday.
3. I'd say they are already quite good on Cache, Inferno and Mirage. Teams haven't got the chance to really look in to their Overpass, so we're gonna need to wait on that. We can't know how Train and D2 will play out since they haven't even played it on LAN. I wouldn't worry too much about the map pool at the moment.
4. The Draken roster didn't have good CT Sides in my opinion, this roster already has much better CT Sides and T Sides. They have figured out their CT and T Side pretty well on LAN it seems, always look on LAN. The only thing is they haven't been together for very long, that means they still make small mistakes that haven't had time to be fixed yet. Those mistakes could ruin whole games, for example that was close to happening yesterday against TL when Twistzz got a massive Deagle Ace.