This experience allows the facilitator to do a better job of relating to basic company issues. On the other hand it is not necessary nor even desirable that the facilitator come from your industry. The industry knowledge and plan should flow from the team's head, they are the ones who will be implementing it. Sometimes it is hard for facilitators to keep their distance from a market they grew up in. Select someone who can establish credibility with the team.
People implement better when they believe.
If the team doesn't believe in the facilitator then they may not believe in the plan. Be sure to select someone who has good chemistry with the CEO and the team. Select someone who can educate the team as well as facilitate the process. All management teams have uneven experience. This retreat is an excellent opportunity to learn.