Jabroni, I bowl with BK, and it very much appears to be a reverse block. Anything thrown to the outside skids out and doesn't recover, but the middle is easier to play. The "good" bowlers here typically play the middle, since the only person I've seen play to the outside is a super cranker with a fear factor.
And BK gets a lot of revs with his X factor, so it does seem to be a reverse.
Scores here are not high by any means, though. I can only remember a 650 something as the highest series since we started our second have a month and a half ago.