I don't understand the, "I would pay him $13 million but not $15 million thing." The money isn't coming out of your wallet and they can find the room in the cap. It also doesn't mean they can't go after Tee Higgins or Jeudy next year. I don't think Bill is going to want to trade the picks and then a big contract to make either of those moves happen this season.
Meyers is the only thing that moved the offense at all through the air this year and I think you pay the extra to make sure this season is your floor for next season and you're not starting somewhere far worse.