don't players in the higher groups have a higher chance of getting into top 8.
for example
A player in group A who loses all in the first phase would go on to group E in the second phase. Even if the player loses all in the second phase he would still get top 8 if there is no lei tai or if the lei tai does not fight till the top. Whereas a player in group E who wants to fight up would have to win every round.
Hence the players in the higher groups at the start would have more advantage.