I thought it was an interesting choice to have Hoid bond with a Cryptic (assuming he does indeed form a Nahel bond with it), since he already has access to the Yolish version of Lightweaving. I don't know if much is know about the Yolish type or even if it requires Investiture to use, but maybe the Roshar type will be easier for him to use with easy access to Stormlight.
Either way, Soulcasting is definitely going to be useful.