I know this is just one site, but at least it's the same writer in an apples-to-apples comparison. If you read through these, I'm pretty sure the ranking for these 3 defensemen would be as follows:
1. Roy.
http://thehockeywriters.com/jeremy-r...spect-profile/ Risk: 1/5 Reward: 4.5/5. NHL Potential: Top-pairing two-way defenseman with great offensive potential, but also defensively responsible
2. Kylington.
http://thehockeywriters.com/oliver-k...spect-profile/ Risk: 1/5 Reward: 4/5. NHL Potential: Top-four pairing defenseman with excellent two-way ability
3. Chabot.
http://thehockeywriters.com/thomas-c...spect-profile/ Risk: 2.5/5 Reward: 4/5 NHL Potential: 2nd pairing two-way defenseman with offensive potential