You can chalk the MGengar up as "advanced" scrafalure syndrome. Where the almighty shadow tag basically confirms a KO because chanda and MGengy are so firetrucking fast and powerful. The advanced part is that Gengy has a "better" movepool than chandalure, and if you predict on switch you can trick the scarf away and chandalure loses some sweeping potential. Hypothetically of course, 5th gen competitive was smelly :^)
I would love to see what they decide with MKanga, something in me things it wouldn't be that good in Ubers, but its pretty strong for OU....
(sound familiar?)