There was a typo in the Ars Arcanum. Just/Confident are the attributes of #2 while Learned/Giving are the attributes of #5. If you take Shallan's first soulcasting being blood as an indicator of her Order, Jasnah being in #5 doesn't make much sense. She stated she isn't good at soulcasting organic material, or something like that, and the essence and soulcasting properties of that Order are all organic/plant-based. I kind of think Jasnah might be in #2. We see her soulcast things into smoke more often than anything else, and the time she uses that stream of stormlight in the alley to cast that thug into smoke the smokestone gem on her soulcaster cracks. It's more of a crack!theory because it messes up the Shallan&Jasnah shared surge of soulcasting, unless there are two surges: one for organic material and one for inorganic.