Two closers turned down the funder's escrow instructions before the third one signed
I'm about as new as it gets, so treat this as a field report and not expertise. Deal was 142,000 to me, 167,000 to the end buyer, both legs on the same day, funder at 1% flat so 1,670.
The funding was never the problem. The funder approved me in a day and a half on the strength of the end buyer's signed contract and a proof of funds letter. The problem was that their money only moves if the closing agent signs their instruction letter, and that letter says three things closers apparently hate: funds are held and released only on simultaneous recording, the A-B deed records first in the same batch, and the funder's payoff comes off the top of the B-C proceeds before any disbursement.
First closer said her underwriter's policy is no back-to-back same-day files, full stop. Second one said she'd do the double close but wouldn't accept a third party dictating her disbursement order. Third one had done maybe thirty of these and signed it the same afternoon, and she also told me she'd need the B-C buyer's funds on deposit the day before, which the funder wanted anyway.
The part that nearly broke it: the end buyer's lender wanted a title commitment showing me as the vested owner, which obviously didn't exist because I didn't own it yet. The closer issued a commitment with a requirement noting the pending A-B transfer and the lender's underwriter accepted that. Took two days of phone calls.
What I'd keep: find the closer before you find the funder. Whether a given underwriter will insure a same-day back-to-back at all varies by state and by title company, so I'd ask that question first now.