William,
Sorry to be so late in replying! I've had a very taxing school year so far, which has left me with very little time or energy for OOTP. Believe me, I've missed it!
Carrigan, at age 36, appears to be reaching the twilight of a distinguished career. In 1919, he appeared in 123 games, hitting .248 with 60 RBI--but a huge spike in his strikeout rate sent up more than a few red flags. Bill whiffed 138 times, well over his previous career high of 90.
In 1920, the Sox traded for a young catcher, Johnny Bassler, and Rough Bill became a part-timer. He thrived in that role, bouncing back with a .273/.316/.391 season. His slugging percentage was his highest since 1915, although part of that increase is probably the result of an overall increase in offense throughout the American League.
Carrigan is currently a 1.5 star performer, and with his interest in coaching and managing, is pondering retirement as the 1920 offseason begins.
(Of course, I plan to keep Bill as a pivotal part of the story...he's way too good a character to allow to leave the stage right now!)