I would too.
As much as I love Kaep, fantasy success is so dependent on team philosophy. Pass early, pass often teams like NE and New Orleans will always produce big fantasy numbers. Detroit is a team with a weak defense and they are usually behind or in a shoot out of some type. Lot of garbage points. Stafford will put up 4500 yards by accident. The fact he had only 21 TDs passing last year was a fluke. I think 30 is almost his floor with that type of yardage.
Kaep and Wilson on the other hand play on teams with good defenses, balanced offenses. They are ahead in the 2nd half in most games, so you don't see a lot of garbage points. They do add the element of rushing yards, but I see them as QBs who will be in the 3500 yard area instead of 4500.