I knew of only one place in the part of Florida I lived, where indigos and kingsnakes shared the same habitat. Six foot kingsnakes where common and seven foot indigos where common. A subdivision was built there...so neither exist there anymore. I would assume that when the two met, the larger of the two would win out. It's funny that you should ask, because several years ago a debate broke out on this forum concerning this subject of who would dominate between the two. I took the side of the drymarchons and that very night one of my drymarchons escaped from it's cage and consumed three of my cal kings. lol