Scarab writes:
MB had many bodies, the terminals mention that a lost shard was finally returned to the Ark.
So its likely that Offensive Bias did take most of MB back to the Ark but missed the shard on the High Charity keyship.
From terminal 6:
[00:H 19:M 02:S]
The seventh and final wave of container ships, barges, tankers, and military vessels engage my fleet; another 214,320 ships, many in excess of [50,000 tonnes], engage my seemingly disrupted vanguard. I continue to fight just well enough to seem lucky. Mendicant, or the enemy, has been sending a small percentage of its fleet elsewhere. Good. Let them believe they can seize a foothold somewhere inside the sphere.
Maybe the High Charity keyship was one of those ships.
From terminal 6:
[00:H 03:M 00:S]
Mendicant was able to postpone its inevitable annihilation for [106:S] with its attempt to flee. But the last of its core vessels hangs before me now; crippled and defeated but still sensate. I could spare it; carve out what is left of its [personality construct array] and deliver it to [Installation Zero] for study.
Maybe he did it and that's how most of MB came to the Ark.
The lost shard arrived on the High Charity keyship.
From terminal 4:
"I have found the shard that was lost. They brought it back to me. Now my reconstitution cannot be stopped."