This is a good reading explaining the character of Nathan Forbes. Sometimes I wonder whether we as viewers are required to fill in too many blanks in order to explain some of the actions and motivations of certain characters, but it does make for more interesting viewing. If there were no ambiguities (or loose ends, or inconsistencies ... ), then there wouldn't be too much to think about or discuss.
The first time I viewed 1795, I thought Forbes' character changed too drastically. Although there are a few hints early on that he may be a rascal, I didn't feel prepared for what his character ended up becoming. Yet looking back at the storyline as a whole, I think it is plausible that Forbes' character was planned like this from the beginning. I would have wanted to see a few more hints early on explaining his character, but that may not be how the genre works. Surprise twists in characters and events may increase viewership. But only the writers and producers could say for sure, and possibly the actor, Joel Crothers, who can no longer tell us.