In order to "keep the ball" we need to learn to possession pass it effectively which is one of JKs building blocks which you claim we don't have the player pool to implement or the time to learn. High pressure is another JK building block. It works best if on offense you build possession slowly from the back so that you properly maintain defensive unit shape. High line pressure is not a good component if you are a counter attack team because it compresses the field and provides less space to launch a counter. I'll repeat again, Klinsman has never advocated slow ball movement he has consistently stressed increasing speed and tempo of the attack as we move up the field.