Yes, I think as they have it and to be honest the breeder well, won't say what I think...... but we need to just concentrate on the little one, making sure it survives and has lots of help now.
If this were my pup at 5 weeks without it's mum around
Firstly I would be buying full pasturised goats milk and some eggs, be giving the pup a half a cup of goats milk with an egg yolk at 6am tepidly warmed (microwave will do, please test though) breakfast would be soaked complete puppy food or scrambled egg, (some pups can eat dry food, but at this age I would soak it with warm water for upto an hour before giving to pup) your friend may even give a soft puppy food, though more likely at this age it will give a pup the runs.
The pup then needs lunch, another meal approx 4pm and a final feed approx 3-4 hours later, pups tums are tiny so they need small frequent meals, at bed time I would give the pup another half cup of goats milk and egg yolk to suffice it until morning.
As well as a very good complete puppy food this pup can also eat chicken, minced meat, white fish with rice.
Very important to make sure the pup is wormed, it probably hasn't been so make sure your friend takes the pup for a vet check.
Too young for inoculations so that will be done at another time.
The pup really should still be with it's siblings learning so many things it will need lots of attention and play.
Above all else after veterinary advice ask your friend to join CD we shall all help as much as poss to get this pup through it's first few weeks.
I'm sure I've missed loads but everyone will help.