I don't think loud will pick Split because Cauanzin said on a vlog that they're working on a map pool to adapt to the opponent strenghts and weakness, besides Sen having lost 13-4 vs 100t i think they wouldn't pick it because 1) It was Sen's map pick and it could just be an off day 2) Sen has a lot of anti-strat material. I think they will either second ban it (Unlikely because it seems like they have two fix map bans Abyss and Fracture) or leave it open for Sen pick/3rd map. What i think they will pick is either Lotus or Bind, because it seems like good maps (let it open on both games) where Sen couldn't anti strat them (but also consider Loud couldn't antistrat Sen on Lotus). At the same time Sen also banned Haven vs 100t, so i think loud MIGHT pick it, but i think it will be a risky choice and they will probably bet on a safe map.
It's hard to predict Sen because it's been one game so we don't have a pattern yet, but i think they might pick Pearl or Split because it's strong maps (again, Split vs 100t might just be a off day - no one picks a map without being confident in it) of antistrats against loud, who has less material of them. So considering they might ban Split because they might not be confident on it anymore, im thinking it will be:
Pearl (Sen) - Bind (Loud) - Lotus (Decider)
I think this map pool is 50/50, Pearl is a good map for both on their showing, Loud Bind is a mystery but they could antistrat Sen (which seemed also great on Bind), and Lotus is a mystery. I'm leaning to a 2-1 Sen but i really think both teams could win and even pull it off a 2-0 on a great day. It's going to be close tho