I have seen poeple work with clickers with pups as young as 8 weeks and get amazing results.
The whole wait to a year thing can be good or bad IMO - much depends on the TD/Helper and HOW they bring out the pups drives - I know that some of mine would have benefitted by waiting and others were not affected by waiting at all.....again, this is more based on the methods used by the trainers than the dog itself, and how you relate to the trianing.
Some pups are into balls from day 1, others are more food motivated...some are so into balls, you have to go to food to keep them under control and learning rather than have them go into overdrive and obsessed with the ball/tug/toy....some pups don't seem to be into balls and then WHAM at 5 or 6 months - they are nuts about balls/toys....and some pups you must marshall every bit of drive to train effectively...only you can decide what your pup's reactions are and what he needs...
You can always learn at least one thing - even if the thing is that you are not going to use method X - from every one you work with IMO - a closed mind and someone who acts as if training is set in stone is someone I would avoid - one of the best trainers/helpers I have known is one who goes to every seminar he can, and always takes away something to incorporate into his reprotraire (sp??) - you should never stop learning!
There is no black and white, written in stone way of training - if there were, we'd all have Schh3 dogs who performed at V levels at every trial! Dogs are animals and have personalities and the key is fitting your ability, the dogs ability and the training into the best experience for you both.
Hexe Sch2, Komet & Kougar IPO1, Kira HGH, SG Bengal, Lynx v Wolfstraum ~ Ziberia IPO1 ~ ATB Basha, Kougar & Kyra, Fenja, Sch3s, Cito, Sch2, DangerRH, Csabre & Alice Sch1s ~Kelsey