I feel like Larian are completely jumping the shark to actually make this entity Jergal himself- that's *stupid* and it also doesn't really fit with the way deities work in the realms. They do not and cannot manifest physically in the realms themselves, except in particularly dramatic situations that are world-shaking events. What he should be is a chosen envoy of the Scribe, given a duty to fulfil by the Scribe, and the divinely-given powers necessary to carry out that duty, which should put him well enough beyond our abilities to interfere with.
Yes, I’d assumed that the “he” that Withers says at some point had spoken and was right as always was Jergal and that Withers was his representative. But I guess it’s possible that Withers is some sort of avatar of Jergal but still separate, or that the “he” refers to someone else (Kelemvor?). Or that Withers can become an avatar of Jergal at some point in the late game when the events become world-shaking - I’m guessing the fate of Bhaal at least is going to be in the balance given this is a sequel to BG1&2, which does seem like something Jergal and other gods of aspects of death would be keenly interested in.
As folk have said, we just don’t know very much at the moment and though it’s fun to speculate I think I’m with Niara on this one and it would be a bit much to have Withers straightforwardly being Jergal himself and spending time just hanging round our camp, however much our story might later intersect with his.
