Li Xiuyuan did this because he saw the potential in Lin Tianming's talent, as well as the overall potential of the Lin Family.
Undertaking such a risk came with significant pressure and hazard, but these actions needed to remain subtle, to avoid stirring controversy.
Fortunately, Lin Tianming's own strength was indeed remarkable, and his performance and achievements in the great battle were there for all to see.
Plus, with his network and popularity, even if there was some small favoritism, the cultivators under his command wouldn't offend Li Xiuyuan and Lin Tianming over such a trivial amount of points.
After all, among the remaining thirty or so team members, only Hu Yuan and Lin Tianming possibly had a chance to enter the Tianfeng Secret Realm.
Among the others, including Tang Liusheng who was at the same late stage of Foundation Establishment, clearly did not possess the strength to vie for the Tianfeng Secret Realm quota, and could only settle for ordinary rewards.