Well, I have my dark, mysterious secrets, other characters can too.
Honestly I wasn't thinking much about it, merely assuming that it would come out again later. And btw, Kelly...Ossanlin isn't nearly so dark or cut-throat as Keshin appears to believe. He's a defender of the People...a sort of Paladin if you will. An emotional, mental, and physical tank. He'll accept the pain so that other people are spared it. He'll bear that pain solidly and silently in most cases...he sees it as a part of his duty. Believe it or not, the most difficult part of Ossanlin's admission of even border-line involvement with Sector Seven for him was not in revealing that his name could be linked to Sector Seven, but actually in the tearing down of some of those barriers and showing a moment of vulnerability. Commanders don't do that, but without the backing of a government military, with people he's led into a self-incurred exile, and with other people whom he wants to gain the trust of, he needs those people to know that he's a real person. That even though he has lofty goals, he's still planted firmly on the ground and he feels things, just like everyone else.
Many people would see cleverness in his actions, but Ossanlin is simply trying to be genuine. That's not to say that Ossanlin isn't clever, or a very well-respected leader and tactician, but people tend to read more into his honesty than...well...just being honest for the sake of being honest. He'll still be a rock, standing solid in a storm of entropy...a guiding force for his people, but instead of projecting the air of being of different flesh, he's showing that he breathes and bleeds like everyone else. Of course, he's doing this in closed quarters with only those he feels he must...but some of his crew still need to see him as a different flesh, or their own resolve will falter. Ossanlin is...complex.