No I don't expect it to be taken as fact. That is why I said 'in my opinion'. What is the point of a forum if opinions are forbidden? With regards to the desiro, I assumed it was just a respray as that is what other posters have stated.
I probably know less than most but given your informative statement about as much r&d being required on the desiro as on the 158 then in my opinion (apparently not allowed), I find it astonishing that a model announced two years later arrives significantly earlier.