I still don't understand dirk's [s]unite and [s]synchronize flash… what's the meaning of jake kissing dirk's head?(what did it revive?) and why is dirk's dream self waking up jake??? Aaawwww can you please explain this to me? ;w;

Dirk’s dream self was knocked out by debris on Derse so Dirk sent his severed head to Jake to have him kiss it to wake his dream self.