The US visa interview queue in Brazil is estimated to take 7 months, if the Brazilian teams take too long to close the roster of the teams probably the americas league will have to be postponed or else there will only be 7 out of 10 teams.
riot got connections
some underworld connections
I'm sure some of the players have been working for it before the announcement.
Riot will probably do something to prioritise their visas
I don’t anything about Brazils visa process so idk
Pretty sure Riot can handle that easily