Chemistry with this new 100T roster won't be that big of an issue, Bang is one of Asun's best friends, which is good for chem, and JcStani teamed with Asuna on Immortals. I doubt Chem will be the issue when issues do arise
Short time to get together is going to be a problem no matter what, even if they have played together before, it will need a bit more time than this to have everyone on the same page.
chemistry is overrated af
put players who may have never played together like wardell, tenz, sinatraa, lft oxy and maybe hiko in a team and they will win champions with ease