When did Seeker become a Dark Hunter?

[quote]BS01, Seeker:
2,500 years ago, after Makuta Kojol returned from his successful raid on Artakha, Seeker was assigned by the Brotherhood of Makuta to guard the Kanohi Avohkii in the Destral Fortress. Over time, Seeker gained a desire to own the mask himself.

1,300 years ago, Makuta Teridax’s Toa Hagah stole the Kanohi Avohkii, and were turned into Rahaga in the process. Cast out of the Brotherhood for his failure to guard it, Seeker began a mission to seek out and reclaim the Mask of Light from the Rahaga. However, he was unsuccessful in this endeavour, as the Rahaga managed to hide the mask in Metru Nui and assured that the Toa Hordika retrieved the mask during the Great Rescue 1,001 years ago.[/quote]

We know that Krekka and Nidhiki were hired to guard the mask, however Seeker was apparently a direct servant of the Brotherhood. Does this mean he was recruited into the Dark Hunters following the theft of the Avohkii, or was he actually hired by the Brotherhood?
If the first is the case, would it have been long between him being cast out of the Brotherhood and him being recruited into the Dark Hunters, or would the two events have happened fairly close in time to one another?