Board Thread:Theories and Speculation/@comment-31377229-20180124191718/@comment-6036561-20180124194239

Quoting directly from the Kage page on the wiki:

Kage (影, Literally meaning: Shadow) is a title reserved for the leader of one of the Five Great Shinobi Countries' hidden villages.

So... no, Orochimaru isn't a Kage, just a village head. Even the "Hoshikage" is not an official Kage

The title of Hoshikage is merely a formality within Hoshigakure as it is not recognised as a Kage by the Five Great Shinobi Countries