I'm thinking the same thing. We may not have the luxury to keep 6 starters in the fold, but invariably teams end up needing at least 6 starters. I guess, if we plan on using Pom in relief (at a reasonable cost), then maybe keeping him makes more sense.
$13M is a lot to pay for a middle relief guy.
Here's a look at how often we have needed a 6th starter or more over recent years:
2016: Price 35, Porcello 33, Buch 21, ERod 20, Kelly 6
6th: Wright 24
7th: Pomeranz 13
8th: Owens 5
9th O'Sullivan 4
10th: Elias 1
Total: 47
2015: Porcello 28, Miley 32, Kelly 25, Buch 18, Masterson 9
6th: ERod 21
7th: Owens 11
8th: Wright 9
9th: Hill 4
10th: Breslow, Barnes & Johnson 5
Total: 50
2014: midseason rotation purge makes it too difficult to keep track.
2013: Lester 33, LAckey 29, Buch 16, Demp 29, Doub 27
6th: Peavy 10
7th: Webster 7
8th: Aceves 6
9th Workman, Morales & Wright 5
Total: 28
2012: Lester 33, Lackey 0, Beckett 21, Buch 29, DiceK 11
6th: Doubront 29
7th: Bard 10
8th: Cook 18
9th: Morales 9
10th: Stewart 1
Total: 67