I understand your points, and I can't dispute your math, but in the event they underman the 76 the net result is more guys on the master seniority list get wide body pay. This means the most senior 75 guy who couldn't hold WB position can still get WB pay which is the ultimate goal. If they man it appropriately, there are an appropriate number of WB seats. If they undermanned it, then there are higher career expectations for the 757 guys getting paid WB pay.
As senior as the 75 is, The reality is that the guys that will hold the "Queen" lines are going to be most likely more senior longevity wise than the most junior guy that got "aced out of the 76 bid pack due to undermanning". This will effectively render your accurate longevity/pay differential analysis void. I know very senior pilots currently in the 75 fleet in both seats who have or are near maxing out longevity wise. So the answer remains "A"
Are you interested in ensuring a proper number of W. seats or "punishing the company". If all of our positions are based in the motivation to punish the company, there is no hope in finding meaningful solutions that meet the needs of both parties. More WB seats are a rising tide that floats all boats.
I'm going to assume you are fleshing this out so all may have a clearer understanding, and not just being contrarian, but it could be vaguely be construed as the logic that I saw so often in the USAF: "it's not enough that I should succeed but others should fail.
VR,
Jakal