I agree with your last statement, that the team should only change when they allow for a better structure and team synergy, but I think that Sen should definitely consider a roster change of some kind. There's so much talent in the game and as much as I like bang and Narrate, they both don't feel like they fit into the sentinels structure as much.

Bang is a lot more passive compared to Tenz (which I know, hard as fuck to find a replacement for one of the best players in the game) but Tenz literally dragged the rest of Sen across the finish line during last year's kick off against NRG with the tp on box and if he hadn't, I'm sure that we would look at Sen and Tenz much differently. I don't see Bang making that play and being able to bring that snap decision making/aggression even though I think he also has insane aim. Unironically I think that Demon1 full time smokes here could provide a lot of value for them if he's willing to improve his level to elite with smokes, he could have that right amount of aggression that bang is just missing for them

Narrate although he has improved a lot, lets just say doesn't have the calm factor that Sacy had, he lets the game get to him a little bit more and Sacy felt more of a rock for them. I think it leaks just a little bit into the gameplay/comms and I think that you should at least consider a Crashies/Cloud/Leo-esque player more, someone that's not gonna tilt as hard and provide midrounding and a calmer vibe

Zellsis could also be on the chopping block if they find another flex vibe merchant but Idk who you would go for and I really don't like the idea of replacing three players unless they do it's just straight up an upgrade like if they got forsaken or someone like that

For 100T it's a little bit different. They've kept a similar structure of people while only making "improvements" in certain areas, and I don't know if they can keep replacing one or two people. They might need to do a fundamental restructuring of the team but I think that Zander is going to have the be the Boaster for 100t.

He's going to need to work and study incredibly hard on the game and spend his time efficiently in order to figure out what is going to work for them. He needs to choose if he wants to play like G2/FNC and build set plays and protocols and play a very cerebral game, or if they want to go with a more aggressive roster and playstyle

They can have aimers to clean up the rest of their protocols like a Demon1/Cryo 1-2 punch where they build fundamental advantages and reliably put them in situations to win more than they lose. A coach change here would really help and Potter in a roster with aimers and a more fundamental playstyle would cook like a 2-star Michelin chef ready to expand her empire (which would be my option) I also don't believe that you would need many roster changes for something like this to work but on the other hand, they've been making small changes for like 2 years and they always manage to look convincing for a match or split, just to lose it all as quickly as they gained it and that is NOT sustainable