If I recall correctly, they were discussing how Longoria was "cheating" to get to certain pitches in the past. A lighter bat was allowing him to get to those pitches naturally. I'm sure it's a combination of things, but I found it interesting.
I recall listening to a Giants broadcast and they were saying Longo has been using a lighter bat this year. This has allowed him to get to pitches he was having a hard time getting to in the recent past. Maybe this is helping drive the overall resurgence as well?