the Pats OL philosophy today is more athleticism, which Sidy brings.
the teams top 2 options are Brown, whose best position is OC, and Wallace, who scored an 8.23 RAS score, which is mush lower than SIdy scored. With Onwenu most likely in his last year, having an IOL that is athletic, experienced and cheap is not a bad gamble.
SIdy when here was not terrible. his rookie season, he had a no show OL coach in Klemm. SIdy still started 13 games. saw 73% of the RG snaps, and made the PFF rookie team with a score of 65. he was much more proficient in run blocking then pass pro at that time
year 2 the Pats changed schemes, and Sidy did not fit Peters OL philosophy. he injured, and fell to 15% of the teams offensive snaps.
I am not advocating for SIdy. I am for a vet IOL. maybe that is Sidy