While Rhyan might be a tad under average of a starting OL, there are currently (of players with at least 100 snaps) only 5 rookie OL that have better PFF grade than him.
Two OTs that were taken in the top 14 overall picks (Chargers RT and Saints LT and Saints LT has an absolutely horrible pass blocking grade, but a very very good run blocking grade makes up for it). So they were not on the draft board when the Packers drafted Morgan.
Two Centers, Steelers starting Center whom has a slightly below average pass blocking grade, but is dominant in the run game. Colts IOL backup from Wisconsin, whom has only played 3 games... and whom the Packers had in for a visit, so they were interested in him. And I think it's fair to say the Packers were not drafting for a Center when they drafted Morgan.
And that leaves just one, 49ers RG Dominick Puni, whom was considered an OT/OG tweener, and I suggested could be a dominant OG, but needs a lot of coaching to get his consistency better for an NFL OT.
So I think it comes down to the question, what were the Packers attempting to draft for when they drafted Morgan.
If it was a Center, they failed, as Morgan isn't a Center, so I don't think that is what they were drafting for.
If it was an OG, then Puni would of been better.
If it was an OT, then it looks like Morgan might of been the best available at his slot.
Of all rookie OL, with at least 60 game snaps, Morgan is 6th in pass blocking grade. Two OTs that were taken in the top 7 overall are the only ones playing OT.
Leaving just backup IOL Center Tanor Bortolini, RG Dominick Puni and UDFA RG Dalton Tucker and it should be noted that Bortolini and Tucker both play for the Colts whom have been starting a struggling running QB.
So once again, it's basically just Morgan or Puni... and Puni wasn't taken until 87 overall. Though I will say, I thought Puni would make a good OG, as he's big, athletic and plays mean, just needs a lot of consistency work on his OT technique.