Are swarmers overrated?

Walker is not clueless, but your assesment of his description differs from mine.
Roy Jones could also hit from very awkward angles, that don't mean he's a swarmer.

 

I mean, that's only one example. There is a lot of material about Greb, you can find and read it on your own.

 

No, Walker was hardly clueless about boxing, but he probably embellished just a tad here. That Greb was able to hit him while facing away... well, I would take that with a pinch of salt!

Walker also made up that nonsense about their street fight... so I wouldn't rely too much on his observations.