Not for the first time this season or recent years, Halstead took a leadership position and stood against Voight.
In fact, he even took a stand against Upton in “Due Process,” although the exchange with Upton was unsurprisingly missing the anger of the exchange with Voight.
And Halstead had a very good point about not wanting to leave Voight to his own devices, considering that Voight had to beat the hell out of a truck to vent his frustrations.
If the downfall of Voight is on the way thanks to his instincts clashing with reform, then Season 8 could be setting up Halstead to take his place or at least assume more of a leadership position.