Arrington?. I cannot remember for sure now, but I would say that he was also in practice squad for a while in his first season with Pats.
That's true. Originally signed as a UDFA by Philly, he ended up on the Bucs' PS for 2008. He ws snagged by the Pats for the PS after the Bucs cut him in early 2009, and then was called-up halfway through the season (to keep him away from Mangini in Cleveland) and proceeded to blow the doors off with his ST play. Finished first in ST solo tackles for the season, playing in only 8 games. Ended up starting 14 games at RCB in 2010, replacing Bodden who was injured in wk-2.
As GP correctly points out, Connolly also. Connolly spent his rookie season on the JAX PS and his 2nd year on IR for them. He spent his 3rd season (2007) on the Pats' PS and most of 2008 as well, earning a regular spot on the 53 as a reserve OL in 2009.
Still, my point stands. Well over 100 rookies (which Connolly certainly wasn't) have spent significant time on the Pats' PS under BB, but only a handful of them have ever made it to the 53-man as regulars in any capacity. So, it hasn't exactly been a developmental treasure trove and the history suggests that it's unlikely that any of the guys who lasted through 2013 on the PS actually develops for the Pats.