rooster sparring behavior

[French Hen]

Hello
I have a flock of 5 week old chicks. One is a bantam cochin and is most definitely a roo. Now he, being a little man, loves to run and jump at some of the other chicks.
Mostly I notice it happening with the same chicks over and over.
Does this mean those particular chicks are also roos? They do sort of look like roos but I can't tell yet. A couple of them will spar back with him.

 

[ChickenCanoe]

No, young pullets will chest bump and attack too.

 

[French Hen]

Oh yay!! He always goes after my tallest chicks which are also my oldest (hence tallest) but those are my favorites and I am hoping at least some of them will be pullets.
Too bad our banty cochin Bitty turned out to be a roo because he is such a character!

 

[Sylviaanne]

No, young pullets will chest bump and attack too.

I was going to start a new thread but since this is here: What about 11 week olds?