Reductio ad absurdum. You argued that Quintana crashing out of the 2014 Vuelta was proof that they were right not to have him as leader... but no team bases their plans around the team leader crashing. Even Euskaltel. Chris Froome crashed out of the 2014 Tour, but he was the defending champion and the favourite, so he was the sole leader of Sky and rightfully so. Yet your argument would appear to be that because he crashed out of that race, he wouldn't have deserved to be the leader, and when called out on this you claim it's to do with differences in team philosophy - but a rider crashing out is not part of team philosophy. Nairo Quintana had just won the Giro and was trying to do the Giro-Vuelta double, and was leading the race at the time he crashed out of it - which was proof positive that he did deserve to be the leader.
In 2007, Caisse d'Épargne abandoned ship on Pereiro and threw their weight behind the two Russians when Pereiro lost fifty seconds.