Wtf makes you think he isn't?
2014: 2-5 against teams with a winning record.
Beat the Bills 23-17 thanks to an 80yd Int return by J J Watt. The D intercepted another pass to seal the game.
Beat the Ravens thank to Keenum coming off the tree to manage the game; the D limited the Ravens to 16-33 on the ground and intercepted Flacco 3 times.
..........
2015: 2-4 against teams with a winning record.
Beat the Bengals 10-6 with the D limiting the Bengals to 256 yards while forcing 2 turnovers.
The Bengals were 4-14 on third down conversion.
Thanks to Lechler for averaging 46.8 yard on 8 punts. pinning the Bengals deep in their end of the field for the most part.
Beat the Jets 24-17, again thanks to the D, which limited the Jets to 267 yards while picking off Fitzpatrick twice.
The Jets were 3-14 on third down conversion.
Lechler outdid himself, averaging 52.1 yard also on 8 punts. Novak made all 3 FGs.
....................
2016: 3-7 against teams with a winning record.
Beat the Chìefs
The D allowed 291 yards but forced and recovered 3 fumbles.
The first one was at the Chíefs 27; the second one at the Chiefs 14; the third one was on a sack to the Chiefs 39.
A couple more sacks by the D (4 in all) end two other drives by the Chiefs.
The Chiefs were 3-14 on third down conversion.
Lechler averaged 49.8 yards on 5 punts.
Beat the Titans 24-17 in a tight game, on the strength of Fuller's 67 yd punt return TD.
The Titans committed 11 penalties
The D some, allowing 320 yards with an interception, but rose up on occasions, like the stop toward the end of the game; with 2:02 left, the Titans had 2-6 at the Texans 6 but was stopped cold.
Beat the Raiders 27-14 in the play-offs.
Self-explanatory. It's all about the D.
....
7-16 overall against teams with winning record.
On the strength of the Defense, one of the best punter in the league, and FG kickers that were no longer liabilities (85% plus FG accuracy in each of the 3 years.
Even if O'Brien contributed some to those areas, it's still not a record of a good HC.
In actuality, his offense has been a liability all this time.
For the most part, O'Brien was outcoached by the HCs of the better teams in the league.