Bozeman is a more natural center and has been playing very well this year. Powers hasn't been too bad either. He's an above average pass blocker and an average run blocker and outside of his best game being in Detroit, he has been improving for most of the season.
So I'm a bigger Bozeman fan than most. That being said... I don't think very well is accurate.
I gave up my PFF membership, and maybe somebody else can provide here, but as far as I can tell, they've got Bozeman graded as a well below average Center. I believe he's like 25th in the league in their rankings.
If I read FilmStudy's reviews, he's given Bozeman poor grades for 3 straight weeks.
I'll copy his notes here:
Chargers:
Bozeman: Bradley had his 3rd consecutive difficult game. He allowed a full sack when beaten left by DT Joseph (Q2, 9:09). He otherwise had only 1 other shared pressure in an abbreviated game. All his 5 missed blocks were losses at the LoS. He was not assigned to pull and made 2 blocks in level 2, but did not have a pancake. His highlight was a combination block on DT Joseph then LB Nick Niemann in level 2 (Q2, 2:44).
Scoring: 43 plays, 36 blocks, 5 missed, 1/2 pressure, 1 sack, 29 points (.67 per play). That’s a high F after adjustment
Colts:
Bozeman: Bradley again struggled, particularly with his pulls. He allowed shares of 2 sacks (beaten right by DT Buckner after Zeitler dropped off, Q1, 14:15; bulled then shed by DE Tyquan Lewis on pull, Q3, 11:56). He was party to 3 other pressure events and allowed a full penetration when he whiffed on DE Kemoko Turay on a pull (Q2, 10:09). He also missed 6 blocks, 5 of which were losses at the LoS. He had 1 block in level 2 and delivered 1 pancake. On 5 total pulls, he netted -4.5 points. He had no highlight.
Scoring: 70 plays, 58 blocks, 6 missed, 1 penetration, 1.5 pressures, ½ QH, 1.17 (1/2 + 2/3) sacks, 44.5 points (.64 per play). That’s an F even after adjustment.
Broncos:
Bozeman: Bradley took a step back. He was party to 3 pressure events, including 2 full charges (beaten right by DT Harris, Q3, 13:39; bulled by NT Purcell, Q4, 2:12). He also missed 9 blocks, 7 of which came on run plays and 6 of which were losses at LoS. This was a game where he was on the ground a lot, including 3 plays where he slipped, tripped, or was shed as he was entering level 2. He had 2 blocks in level 2 but did not have a solo pancake or highlight. He was not assigned to pull.
Scoring: 70 plays, 58 blocks, 9 missed, 2.33 pressures, 53.33 points (.76 per play). That’s a D with adjustment.
Relatively short sample size, and acknowledging that both Indy and Denver have quality fronts that can make a lot of interior lineman look bad. And acknowledging that he got very high grades against both KC and Detroit. But he's been very subpar for the last three weeks according to the people that I trust the most when it comes to analyzing Olineman.
I've oftentimes debated the merits of going to PFF for these ratings instead of Ken, because Ken puts more emphasis on pass protection and most would say PFF overvalues run blocking, but I tend to agree that most of your higher leverage, more critical downs are in pass protection, and quite frankly, if you can't pass block on the Oline, you're probably not going to be starting very long, regardless of how great a run blocker you are.