I wouldn't say so, you get the right ref (i.e. a bad ref) and he could have stopped the fight. It wouldn't have been the right call, but it wasn't so unimaginable.
With Cecil Peoples maybe. Nogueira almost finished Mir, Barry almost finished Kongo and referee wise Carwin almost finished Lesnar, but come on, Silva never was even close to be finished nor did Sonnen attempt to.