Imps and gremlins are not Servitors. One is not a Servitor until one has fledged.
From the FAQ:
Quote:
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A "bound" Lilim - not Discordant, but merely serving a Prince - would have a Superior-forged heart in some Principality of Hell, same as any other Servitor.
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Emphasis mine.
Servitors have Hearts, even if they do not go to Earth. For one thing, it lets a Superior keep track of you. For another, it binds you to that Superior's Dissonance Conditions. Shattering your Heart, deliberately or by Falling, makes you a not-Servitor -- an Outcast or Renegade -- and frees you from your previous Superior's Dissonance Conditions.
This is a primary reason most Archangels and Demon Princes are not interested in long-term service from a supposedly willing celestial who doesn't want to join the appropriate Side and get a Heart from them. A Superior regards their Dissonance Condition as a good thing, and someone reluctant to accept that hasn't bought in to your worldview. They will be more than willing to manipulate a patsy for as long as they can, but they will never invest a significant amount of trust in someone with such a risk of flight or intelligence loss.
And even manipulation has its limits. If someone wants to stay a demon, they want to stay selfish, and they are setting a horrible example for everyone they come in contact with, and an Archangel will not be wanting to let that go on if there is not indication that the demon is coming round to Redemption soon enough ("soon enough" varying plenty between Archangels, of course). A Demon Prince is likely to manipulate an angel into Falling either deliberately, or simply because the demands the Prince makes will sooner or later make the angel do sufficiently infernal things.