Mannerisms of my rooster. Is he expanding his flock?

Recently I posted a thread where I said I had 1 rooster and 23 hens.  However, 15 of the hens are of mixed age and are all younger than my rooster.  I posted asking why he has not mated with them and most people said when the hens lay he will start to figure it out.

This thread is about a little strut type thing my rooster is doing with the new hens.  Some of the hens have started laying and I noticed he has been spending a little more time around them.  Normally the 3 different age groups kept to their own mini-flock but the rooster is starting to take notice.  Well, the move is hard to explain... it's like he walks up next to them and then does a quick shuffle and a half circle right up next to them... like he is rounding them up or something.  I'm having a hard time describing it but maybe someone else recognizes what I'm talking about.   Is this part of the potential mating process or a common rooster behavior?  What does it mean exactly?

If that's too confusing I will attempt to capture it on video later and repost.

Yeah good idea, never did I consider checking their eggs.  My biggest fear is that some of my hens are so tiny... 25 weeks old but probably weigh like... 3, maybe 4 pounds.  I hope he doesn't damage them when mating.  I have 24 chickens total.  9 1-year-olds, 7 6-month-olds, and 8 4.5-month-olds.  They normally stick to their age group.  I'm hoping my rooster will unite the three flocks.

My rooster is a barred rock.  He's pretty cool... big animal.  He isn't afraid of anything either... I swear I have kicked him like a soccer ball 4 or 5 times.. I always get scared and worry that maybe I hurt my rooster but he is so ****** tough he always runs back for more.  I wanted to get rid of him at first because of his attitude but I have kept him long enough I will just carry a bat from my house to car from now on.  I just don't have it in me to get rid of my rooster, no matter how gnarly he is.  I actually want another rooster.  Such a vicious cycle!