It doesn't make much sense timeline wise because the Godskin Apostles and Nobles clothing is already made up of dead Gods' flayed skin and flesh. So who are these other gods when they were already established? The dragons had been subdued and defeated already, the Giants nearly wiped out, and the God of Rot was sealed at the time. The Shattering happens like you said, AFTER, the Night of the Black Knives and Godwyn's death. Which is well after Godfrey/Horah was already banished from Leyndell.