The legality of the matter is pretty clear here and the widow is entirely within her right to be granted ownership of the estate. The steward makes a good case for himself, but being competent isn't a substitute for legal rights.
[X] First Case: The lady has clear and legal right to the inheritance and thus the estate. However, the steward made a good case for his work, so he will receive the right to buy the estate from her at the market value, as determined by the office of taxation of the Imperial Administration. If he is willing to do this, the Iron Bank will certainly be willing to offer him a loan at a reasonable rate and if not, you have many positions in the realm where a man of his skill would be greatly appreciated.
This is not dissimilar from a shared inheritance with non-dividable assets and pretty fair. The lady definitely gets her due, one way or another, and the steward has at least a chance to get the estate, if he is willing to take a loan for it. Otherwise, we got tons of job openings for him.
Congratulations on marrying a woman you've known for at most a week, moron.
[X] Second Case: It is self-evident that Glyllo was not bespelled as he claims, thus he has no right to an annulment. The use of magic to improve the self is inherently no reprehensible act, not dissimilar form buying fancy clothing, using make-up or dying your hair. All of these things also change the way a person appears to others, yet no one would ask for an annulment for discovering a wrinkle or mole on his bride. The marriage stands and must be divorced as normal, though you would approve if they spend at least some time together before doing so, as Nesora merely tried to overcome shyness and there might yet be a chance that he will appreciate her once he knows her a bit better.
Going for a smoke, then on to the septon.