Apologies for a lengthy post, but I thought I'd share the available WGAC stance, based on notes per each species in Avibase, dated July 7th, the latest version available. I admit some changes might have been made since. For instance, multiple SACC proposals have subsequently been passed, rejected or are pending that might revert WGAC decisions (marked *) in the list. However, I assume it's rather accurate, considering Denis LePage (Mr. Avibase) is involved in the project. In short, it seems IOC will lump a bunch of species rather than eBird/Clements split. Also, quite a few species today recognized by both eBird/Clements and IOC will disappear. Species only recognized by HBW/BLI and not part of the list are not included below. And of course, the human error might be involved.