I really like this theory and I think we might have actually already seen the cognitive version of adhesion. Shallan at one point is able to lightweave a vision of Kholinar that was the Stormfather's impression of it through Dalinar. He had to physically touch her if I'm remembering correctly. Shallan also remarks that she can't project the map they use without Dalinar's presence and that the map itself was roughly correct but lacking intricate detail. I think it's plausible to say that she was drawing that map from Dalinar's internal mental map. He's spent most of his life poring over maps during war and would likely retain a basic idea of the land in his head.
