I thought the seals were mixed? I haven't been since 2020, but I know on that last visit I saw the spotteds, harbors and Northern furs all out together
As for Faces being the best South American exhibit, while I do like Faces of the Rainforest, and think it is a really good exhibit, I also think you need to visit more zoos because on any metric I can think of other South American exhibits that are better. At the very least, Buffalo Zoo's Rainforest Falls, which is in the same style as Faces, has a lot of aspects I would consider far superior to Roger Williams' exhibit (e.g., having a second floor viewing platform, inclusion of ocelots and vampire bats, more naturalistic primate enclosures, a larger anaconda exhibit), however RWPZ does have the benefit of giant otters, a few more unique birds (wood rails, piping guans, caciques), and free-ranging sloths and tamarins.