Tomlin & Colbert "The draft is very deep with Offensive Guards"

We've heard it now at least 3 or 4 times from each man.  Then why have we invited only 2 OGs and 4 OTs?
Youll see why below, and youll also see why if we traded back from 24, we'd probably miss out on Massie and Adams, leaving us with zero OTs.

The first question is this: Are Tomlin and Colbert saying “OG is very deep…” as another way of saying “we need a RT as well as an OG, but to do so we need to get the OT much earlier”??? 
  
IE, are the OGs deep only because the OTs aren’t?!?!?!? 
  
Ok, I just looked at the OL at the combine list (hairs on my arms are standing).  There were 54 OL invited to the Combine, add Brooks is 55.  Of those, 43 are either pure OGs, swing OL, or are a best fit as OG in the NFL.  That’s 78% of the OL from the Combine (including Brooks) are either OGs or OCs that could play OG.  Of the remaining 12 OTs all but 4 are top 3 round picks, with 4-5 of them in the 1^st round.  (THIS IS THE MATH/HOMEWORK THAT I BET OTHER BLOGGERS DON’T DO!!!) 
  
Long story short- it’s true, the OG class is deeper than the OT class, but it’s due to the OT class being so limited.  Once again some of those OGs could be swing guys, but for straight up OT vs OG, the number of OTs are very limited and are in the top 2 rounds. 
  
At 24 our pick is Massie, Adams, Martin or Glenn.  Next week is gonna say A LOT with who finishes out our 30 invites.  But the Lions worked out Adams, and if the Bengals/Cowboys could grab the last of the CBs and force the Lions to draft their “franchise LT” in Adams, Massie is ours at 24.