From the new Mendicant Bias article:

"Subsequently, Mendicant was sentenced and locked away on the Ark installation. This would not be permanent, however, and sometime after the activation of Halo, the AI would escape into a Forerunner dreadnought, attempting to make amends for its crimes against its makers by aiding humanity. The ancilla’s efforts were cut short, however, with the dreadnought crashed onto Janjur Qom, the nascent homeworld of the San’Shyuum."

From MB's own statements in the Halo 3 terminals I was always under the impression that the MB fragment on the dreadnought and the one on the Ark were separate offshoots of Mendicant Bias and the AI was made whole again when the "missing shard" on the dreadnought reconnected with the one imprisoned on the Ark. Was this information taken into consideration in that article?

Other than that, in this version, it's hard to imagine how MB could've escaped from his tomb on the Ark, or how/why he would end up on the San'Shyuum homeworld after escaping - wouldn't the portal from the Ark lead him straight to Earth?