I am a big fan of Susan Clothier, and I recommend her free articles at http://www.flyingdogpress.com/ . You need to register at the website but the extra effort is worth it. Read the article It Takes a Pack to Raise a Puppy.
As Susan writes: "The puppy needs to learn to inhibit his impulses - in other words, to develop some self control." And dogs are the best teachers for puppies to learn from.
When you look closely at the pictures, you will see that Olana behaves very differently from Olive when they are around other dogs. To the left you see Olana trying to put her head over Tommy's neck as she is testing him.
Tommy quickly puts her in her place and Olana submits immediately. But she will try again.
Olive is much more submissive. It is enough that Tommy runs by, and she rolls on her back completely submitted. Actually he does not pay any attention to her.
To the right - Tommy with Oak (on his back) and Olana trying to interact with Tommy again.
And here we have Olive again on her back. Tommy is only a year old and he is pretty pushy himself with older dogs, but he is just right with the puppies. He does not overdo it and does not hurt them, but they get a message that he is older and stronger, and he commands their respect.
Asko and Tommy playing with the pups.
It is quite fascinating to observe dogs' behavior in a pack. In the past I was guilty of overprotecting pups, but with experience I learned that some dogs can be really trusted with young pups and by disciplining pups they teach them good self control.