While it is ok to subdivide the team, be sure to mix people, so that cliques do not form. Avoid unnecessary judgmental language and blame. Prioritize discussion and work. Build relationships outside the meeting place and time. Don't type people by some simple categorizations based on personality tests, aptitude tests, skills assessments etc.
People are far too complicated to fit into one of four polar categories.
Have an agreed upon and documented process. Let everyone know where you are in the process. Have multiple processes for different people and situations. We will learn Quality Improvement Story , Theory of Constraints , deBono's 6 Thinking Hats , and TRIZ . Collect data and make decisions based on the data.