Those of you who think Dalinar might be a good alibi for Kaladin are forgetting of course that Dalinar has his own strong motives for eliminating Sadeas...
Plus, Kaladin has become a kind of enforcer for Dalinar, hasn't he? I would think a lot of Alethi would think that Kaladin was just Dalinar's hatchet man doing his wet work for him.
Need a better alibi.