As a body shrinks, it’s angular momentum, the spin rate, increases. All the planets save Uranus generally line up with their poles in the same direction. Uranus spins at a 90 degree tilt. Either it took one large hit to wobble it off it’s axis and settled sideways, or it just might be a captured planet.
I wholeheartedly agree. The impact idea has more plausibility I think, because the Uranian moons are basically “normal”; contrast that with Neptune’s moons.