Monday, create a tool for phone A. Tuesday, delete the tool. Wednesday, recreate that same tool, but now for phone B. Thursday, delete the tool. Friday, recreate that same tool, but now for phone C. ...

What do you think is going to happen? Oh yeah, there's the git logs too.

This is not about one phone. It never was. It's about establishing a behavior.

Also, there's no master key. It does not exist. Apple does not have an "actual master key". Maybe Google does, but Apple has said quite clearly, that no such software or key to decrypt phones exists.