It's debatable between Caldwell and Glenn - Glenn is catching a lot of TDs that Caldwell is not:
Caldwell = 46-574-3 on 76 targets, 60% catch percentage
Glenn = 50-675-6 on 76 targets, 65% catch percentage
Glenn is more dependable, esp. in PPR leagues, and is more likely to receive targets in the red zone. 4 TDs on 8 catches with 12 targets in the red zone.
Caldwell has more potential upside, but is less dependable and less targeted in the red zone: 2 TDs on 6 catches in 9 targets.
The numbers favor Glenn on third/fourth and long, too. Finally, if you want to cite Owens on Dallas, then you need to acknolwedge that Watson is Brady's favorite target on third/fourth and long and in the red zone.
I respect your preference, but the two players are pretty close, going forward.