ESVsX for the 3rd lines:
Smith: 75 (only raw VsX)
Stemkowski: 68
Holik: 67 (only raw CSSR VsX)
Goldsworthy: 66
Stanley 64 (only raw pre-merger VsX)
M.Koivu: 61
Warwick: 60 (only raw VsX)
Drury: 58
Corson: 56
Stewart: 55
Lonsberry: 53
Chamberlain: 51 (only raw VsX)
This is just a starting point to see where our players stand as even strength scorers. Bolded are Regina. There's a wide range from Smith at 75, to Chamberlain at 51; however, their numbers seem extreme because they are based on raw VsX, and Smith was surely on the PP as much as any star forward, and Chamberlain almost surely never was. Knowing what we know about how these numbers tend to look for modern players, I would hypothesize Smith's ES score would be around 70, and Chamberlain's closer to 60. I don't think Holik, Warwick and Stanley merit much in the way of adjustment.
Even with those mental adjustments made, it seems that Richmond's bottom sixers have as much as 5% more offensive potential than Regina's. Can that make a difference? Sure it can. But let's look at what else these players bring to the table. Here is how I would rank these 12 players by defensive ability:
Koivu
Chamberlain
Stewart
Drury
Corson
Stemkowski
Lonsberry
Holik
Stanley
Warwick
Goldsworthy
Smith
I think there are five tiers. First, we know or have very good reason to believe they were elite or excellent defensively. In the second, they have some degree of good defense very much worthy of a bottom six role here. Next is Stanley, who we suspect has "some" defensive ability but it isn't really substantiated. Next are two power forward types, for whom quite a lot is documented, but it seems a defensive game is not really part of what they do. Last is Smith, who I think we are pretty sure is an offense-only guy. I think Regina has the overall edge defensively on these lines. I can't put it into an easily quantifiable percentage like I did for offense, but I think the edge is there.
Lastly, and maybe it's not quite as important as offense or defense, but there is physicality to consider. In a long series you can wear down your opponent, perhaps cause nagging injuries and win the mental battles. Here's where I see these guys as physical players:
Chamberlain
Corson
Stemkowski
Holik
Warwick
Drury
Goldsworthy
Lonsberry
Koivu
Stewart
Stanley
Smith
I think that the two biggest, and four of the five most significant physical threats on these two lines are on Regina. I think we have the physical edge here as well. This, combined with defense, should render their slight edge in raw offensive talent irrelevant. Hedberg is, of course, free to come back with some revised rankings if there is something I've overlooked.