Rules query - Carrying over wounds

The only thing I've seen is extrapolation from a different FAQ question (and honestly should have been clearly stated in the BRB anyway). The one regarding morale re: characters in units that have no other members left, which states that once the unit members except the character are dead, the unit stops existing and the character is once again a separate unit.

So, my take is that while the rules DO state that wounds normally roll over into the rest of the unit, the unit no longer exists and so there's nothing for the wounds to roll into and are therefore lost.

But again, that requires checking/knowledge of an entirely different FAQ answer, but that's so frustratingly par for the course for GW.

The answer can be found on BRB p. 99:

"In the Close Combat phase, enemy models in base contact with both the character and one or more models from the character's unit can choose to attack the character or the unit, or split their attacks between them. You need to declare where attacks are being allocated before they are rolled. If the character is slain, any excess wounds do not carry over onto the rest of the unit but are simply lost.

Remember that models can only attack enemies in close combat if they are in base contact. Therefore, if enemy models are only in base contact with the character, then they can only attack him. If enemies are only in base contact with models from the character's unit, they must attack the unit."

We can add here BRB p. 51: "It can happen that a model causes more casualties than it has enemies in base contact. The excess casualties are removed as normal from the unit as a whole, representing the attackers fighting over the fallen foes."

So, Attacks are either made against the unit or the character. Excess casualties are taken from the unit. Therefore, Attacks against the unit will not carry over to the character and vice versa.

The FAQ midnightfox0083 refers to is based on this principle.  And as vulcan says: while the champion is a special R&F model, he is still a R&F model, not a character.  As such, he is an integral part of the unit where the excess casualties are taken from.