Here are my pullets at 6-7 weeks. They are confirmed BR. They are now 20 weeks and some have started laying. They all matured very differently age wise, and combs looked different each week pullet to pullet.
My vote is pullet. I have 4 barred rock, some mature quicker than others. At 7 weeks about half of them looked like this. They are now 20 weeks and laying eggs. I have back up pictures if you'd like.