As far as i'm concerned, the biggest indicator that he might not be as 'nice' as he makes himself out to be is that he's willing to through the massacre at the grove, if persuaded.
But then again, Alistair in Dragon Age:Origins is potentially willing to watch the PC kill kids and do all kinds of heinous stuff, which is pretty interesting to think about since by DnD standards he's very much good aligned. Paints a very... unflattering image of his character, that potentinal, and maybe Gale, in the instance above, behaves the same, making it just a case of extreme moral cowardness as opposed to outright evilness.
