I hear ya', OP. I see what you were asking.
Yes and no, in my experience.
No, as once you get a split you need to cut it off -we've all heard that before.
But split ends occur ALL ALONG the hairshaft, not just the ends. Co-washing helps keep hair supple enough to where this doesn't happen or can be minimalized!
So in a sense, YES co-washing, "cures" it in that it can circumvent some of the ill effects of splits before they start.
Keeping ends moist and using heat sparingly tend to both happen with frequent co-washers that help keep already healthy ends in tact.
I HTH.
Off topic: Fierce shoes in your avatar.