User blog comment:B214/Question and Answers 6/@comment-26293136-20161125231040/@comment-29963364-20161125233826

From what I've read from the LN, I think it's one of these:


 * Sairaorg does have Demonic Power (so he can use teleportation magic, and use magic seals to hold back his power), but since he didn't inherit the Bael Clan's [Power of Destruction], he was scorned and banished. So in order to make up for his lack of PoD, he trained to be as physically powerful as possible.


 * Sairaorg was born without any Demonic Power whatsoever, so he has to rely on his servants for anything that requires Demonic Power or Magic (teleportation, sealing his power, etc.).


 * Sairaorg has Demonice Power, but like Lirenkus (the Devil boy Issei met in vol.10, and again in vol.17), does not have the ability to use it.

I honestly think the first one is the most likely.