A few day's difference isn't really going to matter, IMO. I've brought two dogs home at 7 weeks because of the travel involved and wanting to have a weekend off to spend with New Puppy. Neither dog had bite inhibition issues, they were never mouthy to me or anyone so they had plenty of time to learn that from their siblings. 8 weeks is best, IMO, but there are other things that factor in like if all the others are going home before that, they aren't going to learn a whole lot from their sibs during that last week, or if you have to travel quite a bit and need to pickup New Puppy on a weekend, that might push you forward a few days before 8 weeks.
I actually prefer the breeder do the first shot and some deworming because I'd rather not bring a new puppy straight to the vet. At that age I think they are more at risk picking up something at a vet office. Most breeders do their own shots and deworming, if they do them. This is not a deal-breaker for me, I'll just have the breeder do it if it's an option.
Liesje & the K9s
Nikon (GSD) U-CH SG SchH1 KKL T1 FO PA TFE-I FDCh-S CL1-R UJJ U-CA HIT TT CGC, free reign semi-retiree
Coke (All-American), couch warmer extraordinaire
Indy (All-American), flyball star in training
Rainbow Bridge Kenya (GSD) U-CH FO OB1 CL1-R CL1-F RA HIT TDI TT CGC