Spren and humans, navani and the siblings bond will be about (among other things I'm sure) a way for science to advance on roshar in a way that is agreeable to both.
A sort of obtuse support of this is that the sibling is a being of both honor and cultivation, adhesion and progression, bonds and growth.
My mind ran away from me while making this post but I think the gist of what I mean is there lol