re: Altering a contract without a signature

It won't be voided.

And a loophole in criminal law is a lot more valuable than a non-material alteration in civil law.

AS to who "wins" that simply depends on the perspective of the litigant. Sometimes a suit is just to make a statement, and even a marginal win, or loss, was worth it.

Also don't know if the contract says anything about fees. If one or the other party doesn't have to worry about paying the oppositions fees, it changes the complexion of the litigation.