Not really. Their are no confrimed Imperial Warlords that are mention and all the remenants were united according to other sources. Keep in mind Aftermath has been retconned a bit. Also no Admiral Versio was not that loyal to the Imperial cause, in fact his motivation does not makes sense. i read Inferno Squadron and BF2 Admiral Veriso is wayyyy different from Book Admiral Veriso. His loyalties are to his family aka Iden and dispite being divorce he was there for his wife gigving her the truth of Iden's "defection". Also the guy who led the attack on Naboo had no choice or he faced death.
I would avoid Aftermath since its a terrible trilogy and creates a unrealistic scenario. The Empire for one is massive and the NR fleet was a joke. You cant tell me that the NR was able to beat the best of the Empire still alive, take over the galaxy, and do it all within a year. I am sorry but that's like claiming that you could destroy a star destroyer with a pebble. The Empire should have at least lasted another 5-8 years even with sabotage within the Empire.
To answer your points:
-I was using warlord as a general term to describe those who wished to break off.
-Where have you seen other sources saying that the empire is FULLY united? Its never mentioned in BF2, but its never stated as well.
-Your facts and opinions sound great to me about Admiral Versio, but his character motivation isn't that bad. I see it as the he's an A+ empire supporter, but ultimently loves his family and will do what he can do best through his Imperial eyes.
-its hard to debunk if the empire shouldve lasted longer. While its true that the empire is much more massive than the NR, i think without palpatine, no leader could truly control the greed, hate, (blah blah dark side). The empire just kind of collapsed on itself since 99% of its people were incapaple of leading, and the 1% would never be excepted by the power hungry. Althougth the empire was huge, it was made of many that were weak. Still, maybe the war couldv'e lasted a year or two longer, but the sabotage efforts by palps kind of ruined their chances.