Ku had been the first to arrive at the meeting of the gods. Most didn't know he was there. He decided to distract one of the lesser gods. After the debate was finished he wanted to go and check out Ares' place of death and managed to hitch a ride on Caeli's passage. He had not intention of showing himself to the others yet.
When the group of gods decided to go to Sangus's cave it got a little trickier. Ku had to use a distraction on Luna just before she shifted away and managed to join the tunnel through time and space.
Once the gods moved to Leila's fortress of poems, Ku just had to walk through her portal. After Ashely gave her short speech, Ku decided to make his appearance. He dropped his illusions and prepared himself for the suprise of the others.