In the OAK/HOU game, I remember seeing a graphic showing Osweiler's stats when he throws it to Hopkins which were pretty bad (more INTS than TDs kind of bad) and when he throws to any weapon not named Hopkins which were considerably better. DET is another example even though they ended the season on a bad note.
For the longest time, I've always been a supporter of getting Flacco a stud WR who we can truly say he's a legit #1. However, I've soured on the idea for the reasons you pointed out. Obviously, I would like a possession WR, but I hope we can get said WR in the draft.