Have to take those stats with a grain of salt. George is a much better defender than Gay, though Gay has a higher defensive rating.
Rudy Gay - 96.4
Paul George - 95.9
Lebron James - 100.9
Kevin Durant - 99.9
Luol Deng - 98.1
Now like I said, no one can guard Durant or Lebron, but Gay does have the athleticism to stick with them and at least present some problems at times.
I'm not saying Gay is a sieve on the defensive end, but he's not on the level of Deng and George, that being said, I'd still want him on the Lakers.