Anomalies in battleground stats

88 Human Warrior
6315
I've been playing around with GetComparisonStatistic() these days and have notice some oddities.

1- GetComparisonStatistic(840) ~= manually tallied total from individual stats

and i think it always ends up being that

GetComparisonStatistic(840) < manually tallied total from individual stats

where 840 is the stat id for the "Battlegrounds won"
http://www.wowhead.com/achievement=840

This is true for almost anyone with more than say 100ish bg's played and much more accentuated for someone with say 2000 bg's played where there can be as much as a 10% difference. I imagine it has something to do with late joins or games that ended before you actually got in.

2- Some players show 0 or "--" stats in EOTS wins.

examples:
http://us.battle.net/wow/en/character/earthen-ring/Skinatay/statistic#21:153
and
http://us.battle.net/wow/en/character/earthen-ring/Pullo/statistic#21:153

Those two players have over 150 combined EOTS played and yet 0 wins. That can't be right.

Where are these stats coming from? It bothers me a little that there are anomalies of the sort and impedes my ability to rely on them for consistent data.

Regards.
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88 Human Warrior
6315
As I persist in my quest for the most accurate numbers perhaps I can ask the question in a more productive way.

Given that the statistics don't add up correctly which do you think is closer to the accurate value?

notes
B is slightly greater than A and the difference increases as more bg's are played for all players.
the resulting win/loss ratio calculations differences will increase or decrease depending on player.

A - the main stats that describe total bg's played and won

or

B - the manually tallied totals from individual bg's played/won stats( WSGwon+ABwon+AVwon+etc..).

If you had to use one to calculate your record, which would you use, A or B?
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