Ok.. it's ARK... sorry.. (spelling was never my strong point... not gonan go into detail)
And in my understanding there was no "True-monitor-of-the-Ark".. Mendicant Bias adopted the role when he found that noone was there.
And no.. he wasent Created to be a "anti-flood" Ai... but he was later tasked with studying the Gravemind... the gravemind currupted him leading to him Backstabing the Forerunners. so he knew alot more about the flood then any other Forerunner Ai (having been a "flood" for a bit)
Mendicant Bias was Suited to be the moniter of 00-The Ark adn that why he took up the task why he arrived there.
And.. .W00T 100 posts

"I? I am a monument to all your sins.."