See, this is where the show faltered. They should have had one other character fight off Kilgrave's command to show that strong enough willpower could defeat his power. Hell, I expected Luke to fight off his command at the last second. They didn't, so within the confines of the show, Jessica is the only one who could resist Kilgrave and it makes it harder to believe that willpower alone could trump his power. Really, either Patsy or Luke should have shrugged off one of his commands. But I understand why they didn't. It would make Kilgrave seem like less of a threat. But by that point in the show, he became a bit of a joke.