It's not that Guan Lun's individual strength is inferior to Yin Tianhe.
However, both of them being Chief of Ninety-nine Divisions, even if they were to fall out over Jing Yan, it's impossible for them to engage in a life-and-death struggle with each other. Yin Tianhe wanting to kill Jing Yan, Guan Lun could only attempt to stop him but couldn't attack Yin Tianhe directly.
Therefore, Jing Yan being beside Guan Lun allows Guan Lun to better protect him. Once the distance grows, with Yin Tianhe's strength, it becomes quite difficult for Guan Lun to stop him entirely without error.
Upon hearing Guan Lun's words, Jing Yan nodded immediately.
At this moment, Jing Yan clearly understood his own predicament. With his current strength, he could kill a Martial Artist like Yin Hua, but in front of figures like Chief of the Ninety-nine Divisions, he probably doesn't have the power to withstand even one attack.
