I don't know much about how the classic cosmology was resurrected for 5th edition D&D, but in the old books, some of the gods/powers/immortals just wanted to end the world or even the entire multiverse. Bhaal, who I agree isn't the brightest candle in the candelabra, is definitely in that category, Bane definitely isn't. He is about tyranny, ruling and owning everything, not destroying it. However, gods in classic AD&D weren't just about getting those souls for keeps, but were more or less powered by the reverence of mortals. This only worked if they stood for their portfolios. So in a way, Bhaal simply couldn't resist the promised carnage, and Bane's chosen successfully supplanted an at least semi-parliamentary government with the absolutist tyranny of Bane's chosen. No pun intended. The run-up to the coronation would have been a huge payout in power for Bane with many new followers. Some of the records we can find also suggest that the Absolute can't produce nearly as many tadpoles as would be necessary to turn all of Baldur's Gate into soulless mind flayers. Bane could therefore afford to see how the other power would react to Baldur's Gate and possibly Elturgard and further Sword Coast cities falling to the Absolute cult. In the best scenario, he would gain control over a vast new nation under his chosen. If the plan failed, he had sufficient high ranking clergy in the area, so a replacement for Gortash who would restore order and peace, and rebuild Baldur's Gate under the black fist, perhaps even openly, would have been quickly available. I'm not so sure about Myrkul, as he was actually killed in the switch from 1e to 2e (set ~130 years earlier) and I don't know how he was brought back, so I never made his acquaintance until now. He was lord of death as much as lord of the undead, and is described as revelling in mortal fear, so I assume until Tav crashed the Moonrise party, he had a really good time as well.
Finding information and neither Tav nor companions reacting also struck me a few times. What also happened, though, was that information that had been discussed before resurfaced somewhere else, and all of a sudden it was big news again. "Gods! Gortash has a mother?!" Of course, the game has to work for a min/maxed fighter 100h playthrough as well as for the obsessive collector who opens every crate and plucks at every thread. Sometimes, unrelated journal entries would update out of the blue, like when sending an item to another companion or reaching an area. I assumed this had to do with patches making changes, so I tended to ignore these little inconsistencies.
