Reason why i think that is because Chakas is talking to the last true reclaimer There is no doubt it's the Chief.
well funnily enough we never hear anyone or anything other then forerunner tech GS/PT etc refer to humans as reclaimers so maybe the monitors of istallations aren't ancilla's but instead durance's(spelling) of long perished humans.
and to you grey that's certainly true though i think kig yar could still be looking for forerunner tech to sell on to the elites or any other race seeing as they have a long history of being smugglers/pirates/etc etc so far my knowledge of the halo verse extends as fars as: halo reach,halo ce,halo2,odst,halo3,the mona lisa, crypyum,first strike,the,flood,fall of reach,contact harvest, and the official halo encyclopedia book, so as for how humanity,elites,etc are doing after the war i have no idea could you please P.M and fill me in with the gaps?