And if you can isolate that faction based on logical arguments, where take into account everything (mathematically possible, humanly impossible), you'll be a bona fide genius.
You are over estimating how easy is to spot a broken faction/commander.
Not like it is the case right now but we have plenty of patches were one or 2 factions were dominant.
Someone has to be the best or worst overall faction. Whether is based purely on W/L ratio or accessibility. That on it's own is fine, the problem is when the gap between the top and the bottom is too big.