Suggestion for Tahm Kench W

I dont' know which board to write this on, but Tahm Kench right now is a 100% bann. The thing that makes his kit so powerful is surrounded around his W. The fact that he can eat enemies is pretty strong and I won't say it's broken because there is counter play to it, but the fact that he can eat his allies without having to stack anything offers no counter play. To balance the champ there should be something you can do to force him to spit out his allies. Such as dealing damage equivalent to the HP of the champion he swallowed. Though the resistances will have Tahm Kench instead of the ally he swallowed. Right now most Zhonya abilities have some form of counter play. Bard Ult requires aim and on top of that the targets remain stationary until the stasis is over. Same goes for Lissandra ult and the item Zhonyas. Tahm Kench however is basically a mobile zhonyas on a short cooldown and even if you stun the target that is being focused. Tahm Kench is still able to swallow them making any form of crowd control pointless. Compared to Zhonyas or Lissandra ult where you can stun the target before they go into stasis.

If dealing the target's hp with tahm kench resistances is too unfair there must be at least some counter play to his W.