It's easy to confuse why you'd ask the question, but think about this.
The cooker is trying to hold a set temp, so for it, it doesn't matter whether there is 1 or 6 it's going to try to hold the temp you set.
The only issue is initially it might take longer because of how much MASS you put it, only when you have it fully loaded.
But it's still going to try to get to that temp.