Mario Moonshine
Smash Journeyman
Well, it's been tested with AR that Fox's body (hitbox) is in front of the visible image produced by Fox illusion, therefore it can be concluded that Fox moves faster than light. Lag is irrelevant, what's relevant is that Fox moves faster during illusion. Fox is faster than Sonic. He also has faster move speed and faster falling speed. Again, Fox is faster than Sonic.