I think team scouts are very open about who they like. I had a Flames scout tell me point blank that he had Toews at #1 his draft year and I'm just a nobody.
Your ability to talk to scouts, and know who scouts are make me think you are more than just a nobody.
But either way it could also be a team a scout that is especially high on any of the defensemen in that list (especially Chychrun) that is just trying to make other scouts feel less sure.
I know when I go to the prospect board I leave feeling very high/low on whichever prospect I just read about and what the general opinion is about them. Then I will come to this forum and see that people I generally debate/discuss hockey needs/issues with regularly will view the same prospect in a different manner than the main board.
It's all about perspective, bias and influence. Once you are at the draft these will influence you to make the correct or incorrect decision. We see the same thing here in the HF rankings.
If I were to list Keller in the top 6 now until the draft, most likely other posters may begin to move him up on their lists as well. I know I am higher on Gauthier now than I was a month ago because the likes of some posters.
Either way, I'd put money down that Chychrun is drafted before McAvoy and that that scout is trying to devalue other defensemen in hopes to get who they want after th 4th pick.