Same team, same defense/offensive plays
http://goallineblitz.com/game/replay.pl?game_id=1786958&pbp_id=6177569 LT does the same thing but might be slower so doesn't get to the NT before the RILB reaches the line.
Third time it was run
http://goallineblitz.com/game/replay.pl?game_id=1786958&pbp_id=6183135 Similar to the OP, but the RILB is delayed slightly more and the LG and LT back up as he comes around, and doesn't shove them/evade them while going around.
Would appear this is a D they either created for or had a tag required to fire that they used against this team. I didn't see the defense in the other 4 times this play was called, but i am seeing it for other pro set O plays.
For example:
http://goallineblitz.com/game/replay.pl?game_id=1786958&pbp_id=6180592Play didn't work because the ILB got bumped by the FB.
A play more similar to the OP (Pro WR slant) is this one (TE Post)
http://goallineblitz.com/game/replay.pl?game_id=1786958&pbp_id=6178811 You can see the ILB moves the same way but can't get to the qb in time.
I think if you look through all the plays where this D fires, you will see the players doing what they should be for the most part. The LB and LT appear to be sliding in (along with the RG many times) to form a tight pocket in front of the NT. The RILB, i'm assuming has an elusive build, is sliding past on evasive pass rush trying to skip past players instead of mowing them over and on the one play managed to skirt by them in time to get the QB.
I would suggest that the OP was just one lucky play where he got in fast enough and the LG/LT slid too far inside before he got there.
Don't know if it should be like this (should the LT/LG form a better pocket even with just 1 pass rusher at the start?) but overall it doesn't look like the LG/LT completely ignored the RILB, just that they didn't stand around waiting for him and by the time he was in front of them he hit through their blocks at an oblique angle and blew past them.
If you need more replays looking at this specific D, go to
http://goallineblitz.com/game/scout_team.pl?team_id=1355&m=defense&for_team_id=0 and scout pro set plays on that specific game. They appear to run it all game long, or at least for every pro set i looked at.