Contador never lost a GT because of Froome. He wasn't good enough to even get a podium in those races so no reason to blame Froome for anything. Their primes almost didn't overlap (except Vuelta'14 and Tour'15).Froome trounced Contador the most popular figure on this forum by a wide margin year after year after year that's the entire origin of the Froome=bad narrative.
2013 - Contador's worst year in 2007-2015 prime period
2014 - Contador beat Froome at the Vuelta in a good fashion: maybe it was the only GT when both were in GT winning form. My biggest regret regarding their rivalry was that they didn't clash at the TdF'14 but at least Vuelta gave me some satisfaction.
2015 - Contador beaten at the Tour after winning the Giro - after such an effort it was unlikely he would win in France (regardless Froome's form)
2016-2017 - Last years of Contador career, no regrets that he didn't win a GT at that stage.