Recent WOB from Comic-Con:
Questioner
If a Radiant uses an Honorblade or binds a second spren, could they get new abilities/ resonances by having access to Surges that aren't usually combined?
Brandon Sanderson
Yes, they can.
Are we going to see Kaladin bond a cultivation spren? Or will Syl end up being part cultivationspren like I’ve theorized?
Kaladin even takes a second in the comic-con reading to wish for a nearby Edgedancer to assist in a certain scenario.