Herbert will do great given the right offense and scheme.
He does remind me of a 'better' Tannehill or Mariota. Kinda awkward in the pocket and kinda awkward running from it too.
Great arm and accuracy, though. Great size and athleticism.
If Burrow, Young and Thomas are gone I'd consider either him Okudah or Brown.
If you give him tall, fast receivers and TEs, like ours, a good OLine, *ehem, cough, cough* and a simple offense, presnap, one read and two options plus a dump off, let him live and die by his arm, he could do well.