Maybe I rate my d-man numbers differently than others, but I see the odd numbers as the one's that do the heavy lifting (carry the pair) and the even numbers as more complimentary players. Suter/Brodin are odd numbers, and Spurgeon/Dumba are even numbers. Before you jump all over the Spurgeon part here's my reasoning.
If you cloned each of them and put them on a pair together how would they look?
-Suter/Suter and Brodin/Brodin would be strong pairs in the d-zone, and a little weak in the o-zone.
Dumba/Dumba and Spurgeon/Spurgeon would be strong o-zone pairs, but be weak in the d-zone. Spurgeon is a very good defender, but he just bounces off the big net-front FWDs and that leaves the goalie screened. I've noticed it a lot on the PK this season. Dumba has improved in the d-zone, but he still makes a lot of mistakes.
If you had to pair Reilly with any of the top-4 it would be in order: Suter, Brodin, Spurgeon, Dumba. I don't want to see Reilly anywhere near top-pair ToI, just saying Suter/Reilly would be the most effective pairing. Olofsson I don't have qualms about pairing with anyone on the flip side.
It's just how I see things.