Splinter Twin has a 4-6 ratio of combo/enablers minimum, with lots of card draw and protection. And they still don't depend on the combo generally (All-In Twin isn't really a thing anymore, right?). Knight/Coralhelm is being tested in a 4-4 or less ratio, it will need more card draw than Twin to be at least as reliable as that combo. It will be like Twin in the early days where people will test an all-in version, generally do well with it, but when people switch their MB and SB's to deal with it you're going to need a good plan B.
Naya Zoo already has that, except it's Plan A. Coralhelm is a tweak to the deck, whether it's just 3-4 copies of that or full 4c with some Geists in there too. Some of the other decks seem closer to a Bant Delver list than a Bant Zoo list, which is fine, it's just not the same thing anymore. Again, kind of like how different Twin variations can get, some are better for some metas than others.