Groups that don't reset the timer have to kill some adds and kite the rest, on your strategy youu just kite all the adds up to the end because you already have some stacks. Thus giving you an advantage. "we did it differently because we kite adds up to the end" is still flawed because of that.
Yes you did kite the adds up to the end, because you could. But if you want to kite the adds to the end, you can't kill any in the beginning. If you don't reset the timer. Kill 24 adds to get the same buff as you and the kite them to the end. You will never make it because there is not enough adds to last that long.