Here are my ideas for a Brazilian superteam.
Role - Player - ACS
Jett - heat - 249.3
2nd duelist/flex - mwzera - 274.7
Initiator/Sova - Sacy - 249.6
Controller - pancada - 215.4
Sentinel/IGL - saadhak - 219.1 (not Brazilian but plays for a BR team)
Sacy is the only definitive lock here. heat is the best Jett but there are a lot of good duelists in BR. mwzera has easily the best stats, but has struggled with not being on Raze. If he can't flex properly it might be worth it to use him as primary duelist and bring in a different flex. Smokes are a big issue, and pancada has some of the better performances. He is easily the most replaceable of these players. saadhak could also play smokes and a different sentinel could be brought in, but no one has close to the same sentinel impact.
Other options:
Khalil: It is between him and pancada for smokes but he doesn't play astra and pancada has way more maps on smokes characters.
xand, aspas, Jonn, dgzin: All great duelists but there simply isnt space. Both heat and mwzera have performed at way higher levels.
chase, gaabxx, prozin, most of HL's players: Not consistently good enough individually to replace the players on my list.
murizzz: Horribly inconsistent. His great masters 3 performance overshadow his objectively bad stats at masters 2 BR and Champions.
If I had to exclude saadhak for being Argentinian, the next best sentinel would be probably Khalil or prozin. I am not really sure what other IGL's exist. I have not been impressed by the other good BR teams tactically.