I have read that too. the way I take a clone is just take any branch that looks good. I still have not been able to notice any difference from top to bottom. clone it I don't think it will stress it at all. I have done it with great results, but if you do take that plant out of flower revert it. i would do it kinda soon, but I don't think it matters if you take the clones now or later. I would do it now cause that means you don't have to wait.