some great stuff here - it's funny in my other life I am an instructional designer who builds online courses. A lot of what I do is building corporate leadership development courses - stuff like effective communication and conflict resolution etc. I wish I had known some of this stuff back when I was more of a full-time musician. Understanding the difference between healthy conflict and unhealthy conflict would have been a huge help

Conflict, even heated conflict, is not necessarily a destructive thing as long as it's about making the music better and the conflict has some resolution. It's a sign that people really care and want to make the music as good as possible. If it's personal or becomes apparent that the conflict will not resolve then it is unhealthy - like two lead guitarists that want all of the solos and neither willing to share the spotlight. Though, playing Dead music and looking at instrumental passages as "solos" is IMHO not the way to look at - they are conversations where everyone has a valuable voice.
Here is a lame example:
Healthy:
"I don't like it when you play the minor third over that C7 passage - I really think we should be playing C mixolydian, not a blues scale"
"Man, I really like the way that minor third builds tension and dissonance"
"When you play that E-flat, it really throws me off my game. I find that instead of feeling in the groove I am waiting for that to happen."
"I would really like to find a way to keep it in there. How about I give you a cue when I am going to flat the third so you know it's coming?"
"that sounds reasonable, let's give it a try."
Unhealthy:
"I don't like it when you play the minor third over that C7 passage - I really think we should be playing C mixolydian, not a blues scale"
"Man, I really like the way that minor third builds tension and dissonance"
"Dude, if you play that E-flat again I am going to knock you on the head with my guitar!"
"F*** You! - I'll play what I want, you're not the boss of me."