In turbulence, and flying at Va we allow the airplane to stall on the big hits to keep from over stressing it. Many times during those big hits, and with the stall warning chirping, the ball swings wildly. Stalled and uncoordinated. And in the pattern when gusty and well below Va (1.3 - 1.5 Vso), this is not uncommon either. As the OP stated, too many experienced pilots have lost control in the pattern (base>final) for unexplained reasons. I've always wondered if this could be a factor.