This one is completed. The sale is going to go through.
This morning I followed up with seller's agent and was able to get additional context. The house is a flip and the guy is simply having seller's remorse thinking he could have got more money than the list price & what we agreed upon in the contract.
I told both of them that I would see this through to the end & wouldn't mind sinking a few more thousand on attorney's fees just to hold everything up and costing both of them some time and money. The home also cannot be listed again until this is resolved and I don't mind him holding onto the flip until we can come to an agreement.
I also posed a second choice to the first option. Originally, I asked him to return my EM plus an equal amount. This morning, I indicated I wanted the deal to go through and would be willing to come up with half of the additional amount the seller wanted. Either option would work for me.
The numbers still work at the new sale price, but it'll reduce my COC as well as my monthly cash flow a bit. But it gets the deal done none of us have the additional headaches. It sucks to get screwed out of an additional 10k, but it is what it is.
Seller agreed to proceed with the sale and will meet in the middle.