@OTC Welcome! Great post.
To Elanmorin, IIRC Syl does comment on the pressure bubble, which I take to mean that it is unusual.
Concerning Dalinar and the Perpendicularity, The Stormfather tells Dalinar that his “is the power of Connection, of joining men and worlds...”
I take this as foreshadowing the creation of the Perpendicularity, where Dalinar Connects the realms, though there are other reasons to believe something else is happening (Odium’s dialogue in particular). The power seems to be a larger use of the usual Surges for Bondsmiths, rather than an atypical usage.
Renarin on the other hand is a total wildcard. Who knows how that will end up working. I’m not sure we have seen enough of Venli and her surges to tell any differences.
Welcome to the Shard!