My question is what benefit would Tom ever have in swapping the pieces purposely? It's obvious who has the mechanical ablilities (or sometimes disabilities) in this case. Diagnosing the problem and figuring out why something does or doesn't work is something you do every day in this field. Questioning everything as you to do the work and problems arise: why does this one fit and this one doesn't, what are the differances, why does this one fit in this one but not this other one, etc...easily getting two parts mixed up.
...and why the fuck are people jumping on Baby J, i mean not that he would mind, lol...but he has done nothing but repeat facts...well, besides confusing mitsubishi and subaru.