Possible Bugs on Tahm Kench

I've been leveling the mastery on Tahm Kench and have noticed several possible bugs(or probably it ain't based on player discretion):

1. Spellthief's Edge, Tahm's Q, and bandit doesn't give gold when hitting enemy champs. For some odd reason the spellthief's charge isn't used. I'm not sure if Tahm's skills can even be used to gain gold with spellthief's. Normally I would use Targon's over Spellthief's but it was for fun to try spellthief's on Tahm.
2. The 5.16 patch on Devour "priority on champions over minions" does not feel to be in effect in-game such that in lane there are still instances that Tahm's W still devours minions in a crowded fight while in lane.
3. Delays on Tahm's W after hitting a 3rd stack on enemy champion.
4. Possibility to put a line missile display on Tahm's W when devouring minion and reactivating W.