I said it earlier.... "You can't cast spells while using a two handed weapon period but here's a justification for why" & "a 2 handed weapon needs to be sheathed or dropped to free a hand for spellcasting not "re-gripped" or whatever because there's no rule for "re-gripping" anything." are hardly rulings that should be controversial or require rules lawyering justification.I don't get what your point is. You have a free hand. One hand casts the spell, other holds the great sword. This is not hard.
The rules lawyering appears to be coming into trying to justify why a player can do something like cast shield while using a greatsword in combat because they are not attacking with it at the time they are casting the spell. Whatever the spell is, the GM has declared that it can not be cast while wielding a two handed weapon.