I believe it is not possible to submit a competing transaction to spend, the identity of the seller (via seller's public key) is included in the script. The CR

I believe it is not possible to submit a competing transaction to spend, the identity of the seller (via seller's public key) is included in the script. The CRS issue is that off-chain, a malicious Verifier (buyer) may learn about the witness, i.e., either enc key or solution.