As a FWIW there have been multiple interviews broadcast on French TV with the several eyewitnesses (farmer, local villagers) who saw the A320 in the moments just before it crashed. All were deeply shocked by what they witnessed but not one, not a single one, mentioned another aircraft in the vicinity..... I wonder where the Mail/Twitter found "their" eyewitnesses....frankly I'd call BS on that story
To be honest the first eyewitness report I heard, sounded like a 'phoner, on the Beeb yesterday the witness mentioned that he had seen several fighters soon before and thought the Airbus was another at first. Presented purely for balance.