My guess is they're comparing the skill positions on paper, determining that Hopkins, AJ Green, their other receivers are better than Woods, Kupp, Van Jefferson and DJax. Obviously Hopkins is still one of the best receivers in the league, but that's probably the only edge I would give them within that group. Kupp has been outperforming Hopkins at this time as well.
Then they're getting excited over Murray with a ton of yards and a high completion percentage (both higher than Stafford), but obviously Stafford has done a lot of other things better, more TD's, less INT, higher YPA (barely, but technically), fewer sacks, etc etc. Stafford is the better QB, but I don't think Murray is a slouch so I get why they're excited about him play this year.
Running back room is probably a push. O-Line likely goes to the Rams, same with TE's.
Defence obviously goes to the Rams.