As you have heard Human Guards have went through big changes during the last months.
The Numbers you state are for reasons most of which are related to the actual functionality of both Orders.
Further information cant be explained to players in this manner of Forum.
Yet personally i expect Human Guards to have new additions to their team when
Head Guard for Humans decides so.
As for the ''imbalance'' in PvP which is created from Guards as you say ..That doesnt exist.
Unless if you consider 6 Non elite warriors much of a ''threat'' for the balance of the game...
For any further enquiries, Kenshin as Head Human Guard will be able to answer you to his discretion as i m not certain how many things can be explained from me on his behalf.
Regards,
wanderer