Well it does connect for me. Kind of. It just seems that it shoud also connect to some out-of-game content. Like some unreleased comic or web-series. Basicaly Mass Effect James Vega situation
That content does not exist.
The only material from previous Forgotten Realms lore is that Balthazar
stole his name from the guy whose ribs he took, that guy happened to be a Bhaalspawn monk, who believed murder existed as deep as his bones. But the Balthazar we meet is not that monk, but a necromancer type guy who just took the monk’s ribs and name for his new life. Aylin is a new character, as is Ketheric, as is Isobel, as is almost everyone in Act 2 except Jaheira and the Gods.