You are in a tricky legal situation:
1. Yes, an owner can give away his contract -- that transfer has to be treated as any real estate transfer and thus you need to go through all the usual steps that you would follow for real estate including transfering the deed (and thus there will be extra cost to do that).
2. If one makes a gift of the contract, it is not subject to Disney's right of first refusal which applies to "sales" of contracts.
3. If there is a loan/mortgage on the contract, you cannot just give it away because the lending company will not allow the transfer unless its loan is paid off first.
4. Now your problem: if you pay off the loan and then the other owner attempts to give you the contract, Disney has a grounds for asserting that what really occurred was not a "gift" but instead a "sale" to which its right of first refusal applies since you are actually paying money for the transfer (the money to pay off the loan) and therefore it is entitled to take the contract for the amount you pay -- the loan payoff amount.