I say Erdrick has about a 75-85% chance he's by far the most likely Square rep but with Sakurai and Speculation we never know for sure we've seen Characters rise and fall throughout the entire Speculation Cycle like Decidueye, Spring Man, Rex/Pyra, Isaac, Bandana Dee, Mach Rider & Chorus Kids and Supposedly Steve too.
Most of those Characters didn't have any leakers saying that they're in except for Steve and he's far from confirmed at this point it just keeps on getting weirder for him we used to think he was 100% confirmed yet he's fallen from that likelihood so who's to say that won't happen for other Characters. We didn't see Joker Coming and so far Leakers have gotten 0/1 right Leakers may not actually know anything but until then I say Erdrick makes the most sense.
Leakers may not actually know anything cause they've gotten nothing right so far about the DLC and they've been pulling for Steve which might not even get in so we really don't know maybe there's a 15% chance of Erdrick not getting in. Erdrick makes the most sense for the Square Rep though so it's still slightly up in the air, We all know Erdrick makes the most sense but just cause he makes the most sense that doesn't mean he's confirmed nor is he deconfirmed.
He's not confirmed until Sakurai says so but he makes the most sense.