Flynn won 57.8% of his 346 faceoffs last year in comparison to Eller winning 50.6% of his 409, if we need a guy for faceoffs and to kill penalties I'd rather pay him $950k instead of $3.5 million.
Winning a faceoff is useless if you struggle at every other area in possession.
Flynn is a replacement level defensive player. Faceoffs aren't magical, they are the equivalent of a puck battle. Winning situational faceoffs is nice but Flynn should never be on the ice against good players.
If you adjust for venue, zone, and score over the last 3 years, Flynn has a 41.91 CF%, 43.38 FF%, 44.49 SF%, and 43.02 GF%. Flynn is a net negative out there.