Defense
RB's individual comparison is mainly in line with what I think, with the following very minor adjustments...
I don't think the gap between Robinson and Vasiliev is the same as between MacInnis and Ching Johnson, I would have simply said MacInnis > C. Johnson.
I also think Pietrangelo and Josi are a little closer, but still give an edge to Pietrangelo, probably would've said Pietrangelo >= Josi
But let's take a look at the pairings themselves...
Potvin - MacInnis: There is no major problem with this pairing, but they are both more offensive minded and played with defensive partners, so they will be losing something there when the other guy decides to jump in. Whereas Red Kelly has been paired with a very defensive minded partner in a scenario to get the absolute most out of him. In all time rankings, I know a lot people go back and forth on Kelly vs. Potvin, personally I am in the Kelly camp, but they are in the same tier for sure. However, with these set ups optimizing Kelly and slightly hindering Potvin, Chicago has the best Dman in the series.
Robinson - Pietrangelo: Robinson is a #1 Dman in a draft this size and a huge luxury for Kelowna. I think chemistry wise he will be fine with Pietrangelo, however, it should be noted that Pietrangelo is really more of a #5 in a draft this size, but will be getting top 4 minutes. This takes away some from the Robinson edge, although this pairing is still a clear advantage for Kelowna. C. Johnson - Doughty has no chemistry issues, Doughty has had plenty of success playing with a defensive minded partner.
Suter - Karlsson: Again, this is fine chemistry-wise, but Karlsson is relegated to 3rd pair minutes, when he's really a #4. And on top of it he doesn't fit well with Potvin or Robinson, so he can't even really be given extra minutes. Not much to say about Chicago, pretty classic pairing chemistry-wise.
Kelowna still has the clear edge on the blueline in this series (how could they not with a top 3 of Potvin-Robinson-MacInnis?), but the above shows it's not as large an edge as the individual comparison makes it out to be.
Further, with a serious lack of defensive help from their forward combined with dangerous counter-attack players on Chicago, Kelowna's Dmen are going to have to hang back more than usual, reducing their offensive contributions.