Starting Lineup going into 2016:
LT: Veldheer
LG: Iupati
OC: Shipley
RG: Evan Mathis
RT: Humphries
----------------
OT: ???
OG: Watford
OC: ???
As for the future, I buy 100% into the current issue that NFL is dealing with at offensive line. The fact offensive linemen are not being trained for the NFL game, and "grassroots" football is giving the NFL offensive linemen that don't run block, and never put their hand in the dirt.
Thus the offensive linemen out of college take time to develop. Thus it is hard to know what is on the roster that can work out, and what won't. Perfect example of this are the Paul Fanaika's and Ted Larson's of the NFL. They find steady work in the league because they are compitent offensive linemen that can run the plays correctly, and win their share of battles.
One a UDFA, the other a 6th or 7th round pick, and they get more attention then some former 1st round picks.
As stated above, offensive linemen are tricky, taking one to be a future right guard, or center in the 1st three rounds would be a mistake for this team. If the Cardinals believe they are playing for the now, they have to choose players that will help them sooner rather than later, and I do not think a rookie offensive linemen is going to help them soon.
Very much so, if you look at the offensive lines across the league, we have one the better groups of linemen.