It’s not uncommon for those who are less vocal or visible to remain in the background when there are more vocal extroverts in the organization. As today’s business world becomes more data driven and teams dispersed around the world where communicating virtually is more common, the introvert is playing and will play a much larger role in a company’s success.
http://www.inc.com/geoffrey-james/introverts-will-soon-rule-the-business-world.html
As you formally or informally create an innovation team goes without saying that you need to take personalities into account. As more and more research is showing the value of introverts in terms of innovation and success, the team consistency should be adjusted to reflect that.
This does not change anything in terms of balancing personalities and the potential contributions of those involved in your innovation efforts. Tap into the potential of those less vocal, allow the amazing ideas they may have to be presented on their terms and sit back and watch progress.