Val wanted me to let everyone know the diplomacy check passed and we are good to move on. I'll post later today when I get a chance.
As far as who knows Ryke, the original party consisted of Llanthor, Grinder, Lestianna, Angriff, and a few other dead or missing characters. It was a special unit created by the late commander Tardanius. They were sent to Lighthorn Keep with the mission simply to destroy the keep. They succeeded, but in the battle Ryke had been stolen away from them by beasts of chaos and assumed dead.
Griff is Ryke's prodige and the others are good friends. They'll surely want to help restore his memory.