Khellendros
Alright boys and girls, take Nate Grey, Cable without the techno virus, and Stryfe, and stick them on an uninhabited island with Doomsday, Savage Hulk and Orion. No one has any equipment, weapons or armor just their minds and bodies. The psychics can't use telepathy to simply shut down their opponents minds (they can cloud, confuse, and create realistic illusions) but can channel that extra energy into even greater telekinetic force. Surround the whole island in an unbreachable forcefield to prevent anyone being tossed into space and who walks out alive? Personally, I'm tempted to go with the Brothers Grey, but I'm open to other opinions.