Here's a graph from an article at MLB by Mike Petriello about the ChiSox getting Yasmani Grandal:
The idea is that Grandal's "elite pitch framing" will greatly improve the team. It turns out that the best team, Arizona, got 400 more called strikes on pitches in The Shadow Zone than the White Sox. So a good team can get about 200 more called strikes than an average team. Three strikes and your out and nine strikes and you've got a clean inning so 200 more strikes is 67 more outs or 22 clean innings.