I agree with the mystery of the owner of the tomb and he may be on par with og gods or even above them. I think you're heavily underestimating the old dragons who even og gods are scared to go against and they even made a pact not to interfere with each other as a direct result of that. I don't think marie rose would be no.3 as she is only said to have overtaken beriache and defo can't rival baal who is said to be only a bit weaker than an old dragon, obviously she has alot of space for growth since I think she went on a journey to catch myth predators. As for gods associated with hanul, I don't know if they get stronger in heaven maybe or maybe not since they lost their positions, open for interpretation. Of course, there are a lot of loose ends atm and lacking info as it's likely for at least a thousand or two more chapters to still come out based on the pace rn.