My favorite is actually Josh Norman #24 coming in from the right, on the ground, waving bye-bye with his left hand. Doesn't even touch him.
Johnson is a special player. I do worry about those jump-cuts somewhat--other RB's use the jump cuts also but not with as much authority because it exposes the knees. He's fearless doing it. He's exceptional in just about every facet of his game. I'm obviously biased but to me he's easily the best back in the league.
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When you put in the work and the time, you can make cuts like that.
Even playing rugby at 290lbs, I always had good feet, I cannot run fast, but I can move quickly.
So my point:
Jump cutting when my legs were 100% trained to play rugby, resulted in a defender whiffing on a tackle.
Jump cutting when my legs were not 100%, even 95%, resulted in me on my face, or doing 2 studder steps and getting tackled.
AND I DO 1 JUMP CUT, and it never ever looked like what we see above. Not 20 or whatever ridiculous amount David Johnson does in a row. Regardless, it takes a lot of power and explosion from your legs.
Point is, it is about preparation. He is young, and strong, he will be fine as long as he keeps his work ethic. Johnson may run like Marshall Faulk, but his personality reminds me of Curtis Martin, and that is a good thing. Curtis Martin was a great back, who had his best year as a running back at age 31.