Rather than styles, the important thing is training methods. If we train against a resisting opponent in all the ranges, we will all come up with something that looks very similar. It is training without resistance that leads to so many variations of styles and systems, because without resistance, anything can work.
Also, methodology makes a huge difference in performance, contrary to the popular belief that it is all about the individual. An individual with extensive training in a "no resistance" style will never do well against a tough fighter. Train that same person with different, realistic methods, and he or she will hold their own.