I've discovered the fastest way to tell a low white pied from a ringer or normal is they always have crazy patterns.
A member posted pics of some of his super low white pieds, and while one is almost indistinguishable from a normal from the top, the crazy pattern gives it away.
Even extreme white ringers have a classic pattern where the white is not, so that's how you know it's a ringer and not a pied.
Gale