Exactly OBJ was setting the league on fire. I believe OBJ was hurt early in rookie season missed a ton of time and still lit it up because he was that talented. It was and is evident to everyone that OBJ is all pro caliber and he an even got an all pro vote his rookie year. OBJ is just as talented as Julio Jones. JC Tretter is not setting anything on fire and he is not as talented as Travis Frederick.
How would you know? J.C. Tretter doesn't have stats like catches, receiving yards, and TDs to tell you whether he set things on fire or not.
As for whether Tretter is as talented as Frederick or not...
http://www.nfldraftscout.com/ratings/dsprofile.php?pyid=105727&draftyear=2013&genpos=OG
http://www.nfldraftscout.com/ratings/dsprofile.php?pyid=90293&draftyear=2013&genpos=C
Frederick is stronger, but I've watched Tretter play. He's not lacking physically, mentally, or technically. In the right scheme, he has a ton of potential.
That high enough level he has to play on to merit an all pro selection is an Travis Fredrick, Alex Mack, Ryan Kalil type level. They are all pros because they change the whole complexion of the O line and they are the premiere players at their position. Im not conflating anything, to be an all All pro you have to be one of the two best centers that year, to be all pro calibre you have to be close play level wise to be in the conversation. Tretter does not have the game changing ability those guys have up front in addition to being unproven. To be an All pro he has has to be a top 2 center better than 30 other centers in the league that given year and I don't see it when he isn't even better than the other center on his roster. All pros are the best of the best and 10 guys cant be all pro caliber. I agreed with you saying he could be good, but he isn't among the group that is the best of best at his position.
Centers named to the All Pro team over the past 5 years:
Travis Frederick (x3)
Alex Mack (x2)
Ryan Kalil (x2)
Maurkice Pouncey (x2)
Max Unger
Basically, you have to be a top 5 Center. I think Tretter is capable of that, especially when you acknowledge the fact that Mack and Kalil are getting old.
Tretter does have game-changing ability at Center. He's an impact run blocker, especially on the move and in space. He's an athletic and adept pass protector. And he's a highly intelligent player who communicates well. He has sky-high potential if he ever stays healthy.
I also disagree with you saying he was playing just as well as Travis Fredrick or Alex Mack. Alex Mack uplifted a mediocre line to one of the best playing between a washed up Chris Chester and mediocre Andy Levitre. Travis Fredrick was simply dominant. Tretter was not playing as well as those guys were.
Frederick plays on arguably the most talented OL in the NFL. And Alex Mack didn't lift that OL up on his own. They have one of the NFL's best RTs, Ryan Schraeder. They have former top 6 pick, Jake Matthews, at LT. They have Andy Levitre who is one of the highest paid OGs in the NFL. Before the Titans put him in a scheme he didn't fit, Levitre was considered one of the top 5-10 OGs in the NFL. There's also the fact that they have a good OL Coach and Kyle Shanahan (let's be real, the Shanahans are known for getting the most out of their OLs).
So let's not pretend like Mack was dealing with crap around him. There were many who felt that Mack might be done after his average year in Cleveland in 2015.