I purposely skipped over the Western games published by Capcom (as I did with all the western games games published by Square Enix). I made some exceptions for series that had mixed western and Japanese development since it wouldn't make sense to keep some entries and exclude others. I guess I should add Dead Rising 3 though, since I included 2.
We've had over a year of Steamspy figures now, and I have noticed that Free Weekends don't really affect the numbers much beyond the following couple of weeks. USF4 had its free weekend last July. It's possible that numbers are inflated a couple percent to reflect accounts that played the free weekend but haven't logged in since, but I doubt the impact is enough to make much of a difference.
To illustrate my point, Rainbow Six had a free weekend about a month ago. Steamspy numbers spiked for about a week, but quickly returned to about the same level as before (plus 20-30k copies, which could be reasonably attributed to the sale they had during that free weekend).
http://steamspy.com/app/359550