Answer:
If two separate disclosures are used -- one for the buyer/borrower and the other for the seller -- you can omit from the buyer's disclosure the information about the seller's transaction on page 3. That's it. All other seller-related information is shown on the buyer's disclosure, including costs on page 2.
The buyer doesn't get a copy of the seller's disclosure form under these circumstances, nor would the buyer receive a copy of any revised seller disclosure issued after closing. The lender gets a copy for the loan file, however.