I think what people are struggling with is assuming that whatever his method is - he used that method in all races.
If he used his brother--then how did he miss timing mats? --He didnt use an accomplice for those races.
Is there a progression--he missed some timing mats, and then he figured it out and didnt miss any more when he added an accomplice?
As to why are there no pictures of the accomplice onthe course - if his bib is hidden as well - or he has a different bib (or there is no bib) there is no need to look anythig like Kip - We wouldnt be looking for the accomplice in photos.
This has probably been done--but has anyone compared chip times at the splits to see if another runner has shown up with the same chips as splits more than once - if an accomplice is helping chip - maybe, just maybe, he's running the race on his own as well.
As far as the 2nd chip theory..
The thought on how he may have did it entered my head, and another poster touched on it. For the races with the shoe tags - not embedded in the bib, would this work?
He picks up his packet and another runner's packet - an alias 'who couldnt make the convention'. He goes to the station to verify the second chip - it reads someone else's name..he gets the person at the verification to enter his information for the 2nd chip? Would both chips work?