It's possible by being very strict and only using Clappers time here on D then his time on the RW section that he might get rated, for arguments sake, 100th best at each position when the guy rating him has him 50th overall.
Trying to think about the different scenarios being projected here.
STRICT: Clapper gets credit only for his seasons at D. The seasons at F are ignored entirely.
Pros: This will give us the purest form of "top defensemen" list. In theory, it doesn't really matter what Clapper did at forward if we're comparing him
as a defenseman. If his achievements at D don't stack up to guys in the top-50, it doesn't make sense to rank him top-50 based on a being a good winger.
Cons: Some players who are generally held in very high esteem could be ranked low or left off the list entirely. This could compromise the credibility of the final product.
MODERATE: Clapper is compared to other players as a defenseman, but his versatility and longevity are recognized as tangential positives.
Pros: Basically, Clapper would be ranked ahead of "pure defensemen" who have comparable achievements at the position. This would move him up the list somewhat while preventing him from overtaking players who clearly did more at D.
Cons: Chances are, neither side is going to be completely satisfied with how Clapper's forward seasons are treated. This solution is somewhat ambiguous in the sense that it only vaguely defines the value of Clapper's forward seasons.
LIBERAL: Clapper is given full credit for his seasons at forward.
Pros: Ensures that a great player will be ranked among those who are generally considered his peer-group in the all time sense. Not many players have been prolific at multiple positions and this method would ensure that those players are credited.
Cons: Could compromise the credibility of the final product and opens up a bit of a Pandora's box. How are we planning to treat Sergei Fedorov under this standard?
My take: Personally I think that Clapper's versatility and longevity are noteworthy in the conversation and should certainly set him apart as a special case. However, I'm leery of giving him "direct" credit for what he did as a forward, when we are supposed to be ranking defensemen. I don't see a huge problem with a top-30 overall player being the 60th-ranked defenseman and 60th-ranked forward, if in fact that's where his achievements at each position cause him to land. We already have a top-100(ish) list if we need to reference his all time placement. So I'm in the moderate category, leaning slighty toward strict.
I do think, quite strongly in fact, that we should agree on one of these approaches as a group before we start submitting rankings. Going into the voting round with mixed methodology isn't going to do our results any favors. We should agree to either recognize the F seasons or not, and generally agree upon
how we are supposed to view them... not necessarily how much weight they are given, but what we are supposed to make of them when formulating our comparisons.