I've never heard not to use a cutting as a mother. It is an exact genetic copy of the plant it was taken from so as long as you're happy with the characteristics of your plant you took the cutting from, i don't see what the problem would be. I've only heard autos are not good for cloning since they automatically flower. Don't know if there is any way to stop an auto once it has begun.Thinking we could take a cutting and make the cutting a mother. But not sure if I heard not to use a cutting as a mother. If I keep it in my tent as a mother @Kirochka13red cant flower it out and that may not be what she wants. Would be great to have a PK mother I think. And as you say. By the time it flips it will be a large vegged plant. She amy have a pounder Purple Kong.
If there are issues with making a cutting a mother, please educate me. I never know it all and am always wanting to learn new stuff.