It seems pretty clear to Thomas Jackson's biographers, not to mention his wife. But what do they know, right?
Touche...
Personally, I believe Lewis was a free man. But, I have read enough to accept that among scholars there is enough ambiguity in the matter to throw a smattering of doubt on the subject. That's all I'm saying.
If Anna Jackson says that Lewis was a freeman, to me, that is all the proof I would need. But then again, I believe he was a free man.