Seriously? Even "more frequently", as you put it, still doesn't equate to quoting CPR as saying it's a "big" concern.
So, if you also watch/listen to the weekly Paul Rhoads show on TV, you'll have seen how clearly he has endorsed Messingham's play calling at various points this season. I don't have to "draw any conclusion" to point that out.
If I were to do so, I suppose I'd guess that while CPR has had concerns from time to time, he feels that his OC has improved as the season has went along. That's just a guess, mind you.
Perhaps he's just saying nice things to help Messingham get another job elsewhere. I dunno. I can't read CPR's mind--but I'd have to say it was one of the two.
Well, if you're putting your judgment ahead of CPR's--whatever he decides, good luck with that.