The journey to the Lost Sea had delayed Lide's plans to go to the Nolan Capital.
He had to write a letter, urging his affordable teacher in the Royal Capital, Spark, to take care, and at the same time, to continue to inquire about the news of the Destiny Tablet fragments.
The journey from the Nolan Capital to Dawn City was long, and even with Castro as his mount, going there would definitely cause a significant delay; it might take ten days to even a month to return.
Now that he had harnessed the Power of Destiny, he knew that the fragments of the Destiny Tablet wouldn't be easily obtained by others, and thus he no longer felt the initial urgency.
So, he wanted to wait until he had settled a few things at hand.