Some of the top 25 dogs of each breed in points, are not able to show. That is how they do it to fill the quota.
I have never had a puppy invite in Westminster. All of mine have been adults- but thats how they do it. As long as they use points to determine, but a dog can change alot from January of one year to the next coming months and retired. etc..
Thats why you see sometimes ( not often) a certain dog take the breed that is NOT a champion.