[traveller79]

I noticed in previous seasons that WAR totals changed between the season and offseason, sometimes dramatically. I chalked it up to adjustments in replacement level at season's end.

But last night I took note of my Mookie Betts card's values and checked it against today's totals. The 2029 WAR had adjusted as expected, but so had all previous seasons, which is not how WAR is calculated--each component of WAR is weighted for replacement level in that particular season, not all players in all times. Babe Ruth's 1927 WAR is not weighted against Mike Trout's performance in 2019 and would not shift according to the performance of players before or after 1927; the same should be true for Perfect Team seasons.

I hadn't noticed this happening in my OOTP seasons, so I'm assuming that Perfect Team includes every new season in its overall calculations of replacement level within a particular league level (discrete replacement levels for Perfect, Diamond, etc), which would have a natural deflationary effect on previous seasons' WAR calculations as more packs are opened and better cards pulled (with allowances for new players and teams).