Uranus can be fit into this configuration. We seem to know little of this planet from mythology . The name for the planet was selected in AD [#?] to match classical mythology as being one of the Titans banished by Zeus (Jupiter), as related by Hesiod. The planet certainly is not the Uranus, "Father Sky," who was the father of Kronos, Saturn. (Cook, Appendix B) [Who was Uranus "Father Sky" then??]
After c. -3147:
All four of the dwarf stars relocated to a distance from Sol inversely proportional to their mass -- with one exception: Uranus, which should have been relocated to an orbit beyond Neptune, but was not. Uranus's orbit, instead, relocated to an orbit nearer to Sol than Neptune's orbital ellipse.
Being furthest removed from the Polar Stack's central Flare-Star (roughly 1.95 million miles) suggests that Uranus was perhaps at a lower charge level (coulumb charge) than Neptune. Thus the 'shock impulse' would have been proportionally weaker on account of Uranus' reduced coulomb charge. (This may not quite sufficient, however, to explain the much larger orbit of Neptune -- an additional 1000 million miles beyond Uranus's 1,700 million miles.)
A further suggestion is that the "long-haired" 'crown' of the Polar Stack (i.e., its axial orientation) may not have been leading toward Jupiter at the time the fateful "meeting at the crossroads," but rather pulling away. Thus, Uranus may well have been the most distant from Jupiter when all three Saturnian dwarf stars received this initial repulsive 'shock impulse.' Uranus may thus have received a much lesser 'impulse shock' than Neptune -- because such a repulsive Force would have had less of an effect after expanding into such a voluminous distance.
What this suggests is that Uranus was simply not set spinning on its own axis quite as quickly or to the same degree as Neptune. [see Kepler's 3rd law, etc]