One of the biggest flaws I see on the Offensive side of the ball

So, you're just going to discount the first 2 games of the season before the injuries started piling up and the next 2 that were competitive?

Carr looked really good behind that o-line and looks not so good behind this one. What changed? The o-line changed completely because of injuries. That's what changed.

Huh? First, the point is that most of the OL from those first two games is back.

Second, I'm just saying that we are playing backups isn't an excuse for having trouble with the blitz right now since all of our starters from those first two games are back other than McCoy. The reason that we are having issues despite most of the starting OL being back is because we don't have a big contested catch guy to run blitz beating quick slants over the middle, Kubiak isn't doing a good job of giving Carr options against the blitz despite the limitations, the running game not being dominant enough to stop them from blitzing, and yes, Carr has never been great against the blitz and should do a better job finding his hot routes and check downs.

I do think that the first two games show that when healthy this is a solid overall OL and a good run blocking OL.

Carr did look good in those first two games. A lot of that had to do with the fact that we had a dominating run game that meant he didn't often have to face third and long and it made play action more effective. I mean he only had to throw the ball 23 times against the Panthers and16 times against the Cowboys. Nobody on offense looked good against Philly or in the first Atlanta game. But, sure, Carr looked good when they made him a low volume QB with a dominant running game that allowed for more effective play action passes and less third and long situations. And the effectiveness of the running game and play action passes in the first two games meant that teams really couldn't blitz Carr.

Carr is a solid but not spectacular QB. He throws a great deep ball, but he has limitations including not being great throwing over the middle, not being as accurate as you would like on shorter routes, a lack of mobility and pocket presence, and a tendency to throw the ball away instead of taking the check down. That doesn't make him a bad QB. He's a mid-level starter which is about what he is paid to be. You would like an upgrade over that but until you find one Carr is fine.