I think that the Almighty said someting like - he was suprised that the Spren were able to mimic what he had given the Heralds. That and Syl reaction to Dalinar's giving up his blade and the vision where all 300 KRs gave up their Shardplate and Shardblades & it faded visably. and a few other things, gives me the impression that when Kal completes his KR conversion (such as confronting Amaram but not killing him - Not seeking Vengence) that it will complete his bond to Syl and she will Morph to the Physical realm as his (on call) Shardplate & Shardblade. Hence the Glow as that signifies her bond to specifically him. This will probably have reprocussions for her as she can never go back. That relates to the KR at the Purelake talking to herself (she was actually talking to her shard). It also might have meaning in th Adonalin talking to his Shardblade, maybe the blade was created by a spren that is almost compatable with him, that he has developed a sort of link. So the KR betrayal of the Spren was to abandon them (locked & powerless in the Shardplate & Shardblades) to be used by non-KR quality people. This un-justified use hurts the attached/traped physical manufestation spren.
Anyway, back to Dalinar, I think that Syls comment had to do with the fact that he was not a good spiritual match for the shardblade Spern & so it was blocking him from meeting his own true spren, Maybe Syl could feel that.
I also think that Syl's appearance as Full Size, and her changing appearance later after the Betrayal at the Tower, is a sign that Kal & she are getting real close to the Change. This Amaram confrontation may be the last step for them - can't wait!!!
