It is unfortunate (unless you have too much business) that this far into the game, you do not understand what a legal description is, and why a deed does not impact legal descriptions, but transfers title. I can not think of a circumstance where a legal description is not created before a deed can be recorded (that is what government surveys [followed by Patent Deeds] and subdivisions/surveys and metes and bounds descriptions are for). Hence, it is not the same as the chicken/egg conundrum...the legal description has to come first so the property being transferred can be precisely described in the deed to ensure accurate location of the tract.
If I want to sell one of two lots I acquired in a single transaction (with title to both transferred to me on a single deed), the new deed would be from me to the buyer and include the legal description of the single lot I wanted to sell. The Clerk and Recorder would simply record it. Not subject to anything. Plus, USPAP allows an appraiser to appraise a physical segment of a property without a hypothetical condition. Even if a seller was selling half of a single tract, say Lot 1 of C/S 200, an appraiser can appraise "the east half of Lot 1 of C/S 200" without any hypothetical conditions. But carry on. As Paul Harvey used to say, "you can't teach a fence post if the fence post doesn't want to learn."
"What is a Legal Description?
A legal description is the precise location and measurement of real property. While an address is often used to locate a property, legal descriptions are used when transferring title because they’re more accurate. Unlike an address, it’s a unique identifier. It’s especially important when purchasing vacant lots with no address."