Man, I love the arm swing of that first guy. It definitely helps his jumping a lot.
By the way, I was talking to Oynur some days ago (actually weeks) and he said he feels the armswing gives him sooo much into his jump... that "aggresive" armswing that he has (also after improving his upperbody strength by a lot) makes a big difference and his legs react so much positively in terms of power generation in a powerful armswing vs. a not so powerful armswing.
