FWIW, there is one tidbit we "know", albeit only through backstage material: Endeavor is one of the big Nebula class battlewagons. Perhaps a prime candidate to survive Wolf 359 - but also a prime candidate for charges of cowardice, as opposed to a scenario where the escaping ship is a vulnerable little Miranda or Oberth. Somehow, I rather favor a scenario where the one or two ships that escaped were dedicated evacuation vessels, staying out of the fight due to their lack of size and armament.
It might help if we knew when Amasov dictated that log. There is no direct data in the log itself, but it would be a tad premature to write something like that before "BoBW", which by all appearances was indeed only the second open Starfleet/Borg battle. Then again, a great number of battles apparently took place between "BoBW" and ST:FC, as indicated by Picard's claim that the Borg advance and the Federation falls back; Amasov could have taken part in those, as apparently Picard did not.
Timo Saloniemi