As others said, snapshotting is a thing of the past(for almost every class) so Crows updates dynamically. Therefore you don't want to waste your first GCD of BW by casting Crows.
I use mantle/boots, so double DBs is a full reset after the first KC in BW. This is why I go KC>DB>DB>KC, not using a cobra in here means I've saved 40 focus and with a crit focus instead of haste I don't focus cap.