I found out the hard way. I figured I could join Bhodi first and then get Edwin. Normally I am very cleaver to keep enough saves along the way so that if I do mess up, it is not so painful to go back a bit. But..........In the particular game where I went as an evil char, I got really into the game. I went on a 24 - 30 hour playing binge - no, I was not sober
. I was having so much fun doing all my alter ego stuff that I neglected to make permanent saves, I went *Q* all day. I then figured out the very hard way that I was going to be unable to pick up Edwin. I was super pissed. I came here and asked questions, only to find out I was screwed (most likely). I have left that party for the time being and took me first char from BG1 that went through BG2 and am at the cusp of finishing TOB.
I think there is a way to ctrl q(?) him into your party, but I am unsure about that. Do a search in the forum for further info. Good luck!!!