User blog comment:B214/Volume 22 spoilers/@comment-82.48.158.172-20161101093449/@comment-30048084-20161101140229

Just as crimson said Lilith is still a Dragon God, In Ise's case multiple factors allowed him to recieve his evil pieces again.

The primary factor is that his evil pieces were already bonded with his soul therefore they can return to Ise without problem, so far it has yet to be clearly defined what Ise's current state is but we assume he is a devil again not something else.

Unlike Ise who only recieved a part of Ophis's power Lilith is made up of only Ophis's power and I guess Ophis's Divinity(not sure if she has that).