I think it's clear Miami's drafting receivers this year and one of them will be expected to be the teams 1, 2 or 3 option. If you keep Bess and then sign Jennings or Wallace and resign Hartline there's your 1, 2, 3 right there. You're not signing Hartline for $5 or $6 million to be your #4 wr and you're not wasting a high draft pick for a #4. So if the team is going to draft a wr in the first or second round there's not room for Jennings and Hartline, one or the other but now way both.
I think Miami is looking at Hartline as a safety valve right now, they will resign him only if they strike out on Jennings, Bowe or Wallace. If Miami misses on the big three Hartline would be the obvious 4th choice. I could see Miami signing Hartline and then drafting a wr in the first or second round. Keenan Allen, Hartline and Bess would be a fine 1, 2, 3. They would still have to spend a later draft pick on a #4, someone like Marquise Goodwin of Texas or Markus Wheaton of Oregon St. would give the team more speed.