The theories are all cool regardless of who's right, but the weird postings demanding we must believe it is Partridge are just strange. It could be him, but chill out why are you so obsessed with making us admit you are 100% correct that it is Brett.

For me, it's unlikely to be Brett, mostly cause he's dead, but also, the whole: "I'm surprised the two of you didn't become lifelong friends the moment you shook hands." 

Why would anyone say that of Brett?