Hmm the Ashspren and Highspren have not yet been addressed, only Honorspren and Inkspren, the latter are now even more adamant against Nahel Bond and Surgebinding but former were convinced.
The Son of Tanavast, riding the Highstorm, "Stormblessed" thing... I have no idea, he seems to have a Connection with Tanavast's Cognitive Shadow.
Okay, third Bondsmith, with the speed that everything's happening in, it might happen in the very next book (which was originally planned to be the Bondsmith book, while Oathbringer was supposed to be the Skybreaker book). I actually like the suggestion of Adolin better than the Mink (sorry OP), he's uniting humans and spren, so. As for the Kaladin red-yellow eyes thing, Odium has Invested and integrated with Roshar, there's plenty of other characters who are interacting with multiple Lights / Investitures: Renarin & Rlain: whose spren were originally closer to Cultivation than Honor, and have now been Corrupted by Sja-Anat with Odium's Investiture. Venli can use Voidlight to fuel Surgebinding. I think whatever happened with Kaladin was a natural effect of this, plus Odium trying to Connect with him.