You Must always keep 3 figures on a Team base, would Lockheed count towards the 3 characters even though he can not be given the solo adventure? Playing them in an hour. Don't wanna play it wrong, and I have searched and not found an answer.

DISTRACTION: When you build your force, Lockheed may be attached to WXM #T003 Excalibur as a team member but can't be selected for Solo Adventure. When attached, the team character can use Energy Explosion as if it had "1 target

Yes. Lockheed is a character, so he would count.

I put in bold the important part.