The obvious conclusion is the our new OT, Ryan O'Callaghan is better than last season's incumbent starter Damion Mcintosh. While I have to agree that Mcintosh was just a speed bump (and a bad one) the numbers aren't too heartening. 

These are the sacks allowed per games started for the two years Mcintosh was a chief and the two years Ocalli was a patriot.

Mcintosh

2007 - 0.5       started all 15 games he played in

2008 - 0.43     started all 16 games he played in

O'calli

2006 - 0.75    started 6 games, played in 11

2008 - 1 .0     started 1 game, played in 15

O'calli's sample data are poor since he had such limited play. If you do him a big favor and and assume he saw lots of playing time in 06 (which he may have, hopefully someone knows because i sure don't) and adjust the stats for sacks allowed per game played in (as opposed to started) you get this

(Sacks allowed) 4.50/11 = 0.41

0.41 sacks/game barely bests Mcintosh even with less play time

it should be noted that 2006 was his rookie year of course and he had just come off of shoulder surgery.

My take away from this is that since he is again coming off an injury that he may not just walk in a be starting calibur. We will have to keep a keen eye on his progression

Still more upside though since he is young and has not seen a lot of playing time. room to learn and improve whereas Mcintosh was a vet and had capped out on his experience/talent ratio.

Ikechuku Ndukwe allowed 0.06 sacks per start on 15 starts last year in case someone wanted to know. That was at G though.

Source: hosted.stats.com