The game evolves. There are wrinkles. Verbiage is different, Architecture of an Offense is different. Every team has a wrinkle of West Coast. San Francisco runs some power T concepts. Every team runs RB power. Every team runs mesh concepts, and 4 verts. If you have a QB that can diagnose a Defense. Has the sense to audible into a play. That is not a system QB. His system did not teach him to diagnose cover 1 from a safety blitz from the A Gap. Put a man in motion to recover zone from man. In a 3 rd and short. Then audible to a run play to get the first down. His system will teach him progressions.Verbiage. Very rarely are teams going into a 3-5 step drop on timing. This happens sometimes. This is not the 80’s. There are plays design. The slant is one. Football I.Q. Is amazing. Playing QB is like hitting a baseball. Trust your read, analyze. You are only going to have 3 to 4 seconds to get the ball out. What is the situation. Know where to go with the Ball. If you hold the ball a half a second too long. You better scramble. You are already too late. A system doesn’t make a QB. If it did. The Browns would just run the same Offense Texas A & M did with Johnny football regardless of the Defense, and talent.