I took the linkage apart and reassembled it off of the frame, and it definitely was coming from the top part of the link. I thought it might be coming from the bottom link but it was pretty obvious it was coming from the top, you could feel the rocker arms moving back and forth. Not a lot, but noticeable on the bike.I have an '08 and I had the same play "feeling" of lifting the bike up by the seat and feeling it, but it was actually play inside the lower link. I tapped the pin out, covered it in bearing retainer compound, re-assembled the frame, and then let it sit for 2 days to cure. Problem solved.