I have channeled my inner analyst to make this post. (This is provided that G2 play their same triple sentinel comp.)
TL comp:
Raze, Soulcas
Sage, L1NK
Viper, Nivera
Sova, Jamppi
Chamber, ScreaM (controversial opinion but hes got great aim, he should have no problem transitioning to aggro/vertical chamber)
I changed omen for sage due to the fact that Jamppi is better on sova then he is on omen and sage is super good on icebox (plus, L1NK used to be sage main). I put Nivera on Viper because it was his comfort pick back in Champions. I changed soulcas to raze bcos she is good counter to sentinel class (which G2 love to run on Icebox). And finally I put ScreaM on chamber because he has cracked aim and I think he'd be good chamber.
feel free to share criticism or ask questions in comments, I'll try to answer them all :)