MAMEWorld Forums - The Loony Bin - Any advantage to mixing paint and primer?

I hired a guy to paint a room which was dark green to a light orange.

He originally said he didn't need to prime the walls first, but I insisted he prime first because a test spot I did still showed hues of green through three coats of paint. I even went to the store and bought the primer for him to use before he arrived... then I had to go to work... I asked Gatinha to make sure he primed first.

I come home, and the walls are some funky shade of pink, and Gatinha explained that the fucker mixed paint into the primer. He gave my wife some bullshit story about how hard it would be to paint a soft orange color over pure white, and she bought it.

The only rational I can think of for mixing paint and primer for the primer coat is because you're hoping to finish the job with just one coat of paint.

I'm tempted to just fire the fuck and finish the job myself on what little spare time I have anymore (work is busy as hell... which is good, I'm not complaining... it pays the bills), but I don't want to can the ass before making sure he isn't right.

Anyone ever heard of an advantage to mixing some color into the primer coat? Am I just hot under the color because I'm over worked and pissed I'm paying a guy to do a job I'd normally do myself?

Your thoughts?