Yes.
And......?
Your argument about the "stance of the CR" still doesn't hold any water.
Since we have had to banter this back and forth, I am going to second what diogenes ghost said:
Oh fer crissakes, name another fighter that has more than one engine model.
Your response about the F-35 being so important that we need it doesn't hold up to logical scrutiny in this budget climate or environment.
We can't afford "jobs program" defense dollars anymore, and I have come to the conclusion that this second engine is about as useful right now as a second engine for the Sherman Tank.
F-16. Great Engine War. Read up on it.