Thanks Tom for the very helpful reply.
The tools are great! I'm currently writing guidelines for the copywriters and in that document, I need to provide a guide on how much copy will need to be updated. The tools would work well as a 'check' to make sure the copyrwriters have updated enough of the content but I'm unsure what direction I should be giving upfront.
The video with Rand is really useful though (especially #4)! This will be helpful with internal discussions around how there is no 'magic' percentage number.
Thank you,
Emma