Rocha VS Thiago orr Rocha Vs Shields would be an absolutely sick grappling match. WW has their own Damian Maia now in Rocha. Maybe Vitor Vianna if the UFC get's their head out of their a$$ and sign him to WW/MW is a deadly well-rounded MMA sub mater.
If you only pick two:
Both deserve to be showcased in Brazil for what they've done for MMA over the last decade.