This next series will reveal a lot about Darnold. If he can't string at least a couple first downs together it will be telling. He needs to step up here and answer that Browns TD with a drive.
It would do if JD didn't get any other offers and didn't really want Sewell and was just looking to pick up an extra pick or picks. Remember that if the other team thinks that you're being a dick with them and are being greedy, they will likely do the same thing to you when you want to trade up with them. To move up one spot, I think a 3rd would be fair compensation.