Vaalingrade
Legend
They can still make other justifications than the default.I don't know if you do. But @TwoSix is asserting that 2) is a subset of a grouping where the players make justifications. Thus if players aren't making the justifications then it's not a subset of that grouping...
Spell slots aside from the Jack Vance method could be something else. Personally, I never use the 'precasting' explanation the game pushes, and certainly not FR's 'weave'.