To put it nicely, he would be feared by all. To put it bluntly, he would become the public enemy of the Nine Provinces.
If the fact that he had obtained the Blood Immortal Sect's inheritance were ever exposed, his parents would have to be prepared to make enemies of every Daoist Lineage Influence in the entire Nine Provinces just to protect him.
In the original storyline, Ye Ming obtained the Blood Immortal Sect's inheritance and spent a long time as a pariah, hunted by everyone and forced to hide. But he was a Loose Cultivator, after all. With no family ties to hold him back, he could go wherever he pleased.
But Jiang Lan was different. He had to think these consequences through carefully and plan for future escape routes.
He'd personally had Chu Chan deliver the invitation to Ling Zhuyun. Given Ye Ming's friendship with Ling Zhuyun, he was sure to be worried and tag along.
"Thank you all for giving me the honor of your presence at this tea gathering today."
