This kind of metric has been around for years. IIRC Halloween at one time was near the top of this list.
Sure but the figure they use doesn't take a lot of factors in account to calculate RoI (what about distribution costs too?). I'm not saying Get Out and Split didn't make a ton of money, just that their reasoning is flawed.
So maybe Annabelle? I'm doubting Saw and It since they're bigger and will probably have more marketing money on those. Probably wrong, though.
Annabelle 1 made most of its gross overseas, and it was a pretty bad movie. I don't see this one making nearly as much.