It's a tough call. One thing to consider - he was the BL and pulled the rug out from multiple venues. So - I'm sure that his reputation with them isn't stellar. His presence in your reformed - well received - band may raise some eyebrows, as venue owners tend to remember being burned. In any case - I think a band with multiple vocalists taking turns on leads is generally superior to a band that has one lead singer - unless that lead is exceptionally talented. My current band - 3 of us sing lead throughout the night, and I really think it's the reason people like us. We are able to play a very wide variety of music because of the vocal ranges/styles that we have. There aren't many dedicated lead singers who have the ability to pull of multiple genres/eras/styles/keys well. So if you have a situation with multiple leads now, you may honestly be a broader appeal than having one (problematic) lead singer.