Everyone realizes we had difficulties stopping them on 3rd down in the Arizona game. It's one reason I was so happy to see them adjust to press man late in the 2nd quarter and shut them down on O. There were no problems in the other two games. Ok let's break it down.
Vs. ClevelandSeries 1: 66 yards on 11 plays. Missed field goal after penalty. No other penalties on possession. 2 3rd down conversions, against Blackmon (#4/5 CB) and Williams (#3 CB).
Series 2: 3 and out.
Vs. BuffaloSeries 1: 5 plays, ending in an interception. 12 yards gained prior. 1 3rd down conversion, on 3rd and 1 (Lynch ran for 3 yards).
Series 2: Fumble on 4th play, on 3rd and 15. One penalty against O.
Series 3: 7 plays, 13 yards. 1 3rd down conversion. Punt.
Series 4: Fumble on 6th play. 11 yards on 5 plays prior. Fumble on 2nd and 16.
Series 5: 19 yards, 6 plays. Punt. No 3rd down conversions.
Series 6: 24 yards, 6 plays. Punt. no 3rd down conversions.
Series 7: 3 plays, 19 yards. Sack and fumble on 2nd and 2.
Vs. ArizonaSeries 1: 4 plays, 22 yards. Drive ended on a fumble. 1 3rd down conversion (3rd and 1), pass complete vs. Al Harris (slant).
Series 2: 10 plays, 59 yards, ending in a field goal. 1 for 2 on 3rd down conversions (3rd and 9, to Fitzgerald vs. Williams).
Series 3: 6 plays, 14 yards, fumble and Defensive TD. No 3rd downs.
Series 4: 8 plays 70 yards. 1 3rd down conversion (3rd and 10, to J. Urban).
Series 5: 3 and out.
Series 6: 2 plays, ending in an INT.
So the worst game our starting D had, they gave up 3 3rd down conversions. Keep in mind, this is without game planning specifically for the offense we were facing (Capers has said as much).
Anyway, I just ran through all 3 games and it turns out our D was 8 for 16 on 3rd downs. 50%. No idea where he got that 68% number.