The troops that Qing Zhen and Luo Lan controlled were only two brigades originally. But with Luo Lan's troops hidden where nobody knew, the Qing Consortium couldn't incorporate them into their own forces.
As such, for the entire frontline troops, there were not many true supporters of Qing Zhen as one would imagine. A portion of the troops supported Qing Zhen while a portion supported Qing Yun. Most of them were neutral and only followed orders and fought battles.
This was also the reason why Qing Zhen wanted to get rid of Qing Yun's supporters in the organization. If he didn't chase away the people who harbored other motives, his orders could end up getting secretly disobeyed.
But even after Qing Zhen finished "cleaning up" those elements, he still could not defy the orders of the Qing Consortium's Board of Directors. They were the true core of the Qing Consortium, after all.