Would that allow him to detect Marked Harmony post-Jaunt, or would he still need to pick up the skill itself for that? I assume it's the latter, but I just want to be sure.

Also, would examining the QC-style Bond between himself and Gil tell him anything about it, beyond the fact of its existence?

And getting away from bonds or a bit: for The Gap Between Descriptions, would a transformation last beyond the Jaunt if the skill were used in-Jaunt, or would it end when the Jaunt did? I know it's permanent otherwise.