Only 1 puppy survived in the litter

Question
Hi,
I just got a call from the breeder we were to get our gsd puppy from.  The puppies were born 2 days ago and 1 puppy was quite a bit bigger than the other pups.  He was the only one who survived.  My question is:  would you advise us to buy this puppy?  Would he be properly socialized without littermates?  The breeder says that he is healthy, but he has also given us the option to get a pup from another litter.  I know that my breeder goes to great lengths to socialize his pups with kids and people, etc., but I was just concerned about the fact that he would be an 'only child'.  Thank you!

Answer
That is a good question.  The mother does provide much of the socialization and if there are other dogs in the household the puppy will be exposed to, it would be better.  

It also concerns me that the other puppies died.  Did the breeder say what happened?  Could the breeder lack experience or to not have chosen the healthiest parents?  In even the best bred litters, sometimes a puppy or two doesn't make it, but all but one?