So it sounds to me like you are looking at adaptability as a means for survival, therefore giving the individuals a better chance to reproduce. Is that correct?
What about say, speed of an antelope. The antelope doesn't decide to run faster or slower based on the lion chasing it. It runs as fast as it can because that is how it is programmed.
"Fit to survive which is clearly adaptability." What if there is not a need for adaptation in a particular instance. Say, the antelope never gets caught and never has to be faster. It doesn't adapt if it doesn't need to, so it is still going to survive without adapting, because it is the most fit to survive. Its possible for the animal to never change and still be the fittest animal in the world. This 'fittest to survive' animal does not need to be adaptable in order to survive.