Imo Wyll was partially because of feedback and partially because at the start Larian said they started with the evil and ambigious companions to get more feedback on them and will add good companions later.
But then they ran out of time, scrapped Helia and pushed Minsc into act 3 to still have him for marketing purposes. So they rewrote Wyll and Shadowheart to be good (or at least to have a good option)
I guess I'm already at the point with this game where I just want to know how the sausage was made. Being in the EA for so many years has made me too interested in the decisions and the process behind the end product I think
