I should think it very unlikely that a pitch control anomaly would cause a midair collision during probe and drogue refuelling for the simple reason that the receiver is (supposed to be) behind the tanker. Up and down movement could certainly tear the probe off the receiver or rip the drogue off the hose, but neither would be expected to cause much damage due to the presence of weak links. Besides, the instinctive response to any developing danger during refuelling is to slam the throttle to idle and “exit stage rear”, emphatically not “exit stage forward via the tanker’s right engines”.