Was Planet Nine exiled from the solar system as a baby?

We know closer-in planets form in a disc of dust and gas surrounding a star, but, like Planet Nine, some exoplanets have been seen orbiting much further from their star, up to thousands of times more remote than the Earth-sun distance, which is well outside where the disc formation process should be possible. They showed that, early in the solar system, the jostling of the giant planets Jupiter, Saturn, Uranus and Neptune could have resulted in Planet Nine being kicked out after initially forming closer to the sun, potentially removed from the system for good. But for our solar system, the chance of a wide-orbiting world like Planet Nine being created could have been as high as 40 per cent, provided the jostling of the planets occurred early enough in the cluster phase.