Discipline? Malata? From what we've seen of her, and what she's told us about herself, including her being in The Diagram, she's particularly lacking in discipline
Do note that Shallan isn't very truthful either, despite being Bonded to a concept of underlying mathematical truths, in fact, those lies are what fascinates him. Spren aren't just looking for paragons of virtue in their respective Orders, some of them seem to be looking for people who need help, who are facing a personal crisis relating to that Order's Ideals. They're attracted to things that fascinate them. They're also sapient beings, not mindless spren, so there's an element of choosing there too.
Inkspren don't like the idea of Bonding humans again too, but Ivory still went for it. Maybe there are individual Stoneward spren who'll go for it too *shrugs*
*sighs* But much like with Adolin, I don't want every character to be Radiant