The emperor's actions were indeed driven by his concerns.
Tianci as a name would be perfectly suitable for a prince, Son of Heaven's blessing, which speaks for itself.
An inappropriate choice for the young prince; it may invite misfortune.
As for names like those that promise glory to the ancestors, no need to mention, it's just plain.
Everyone dared not outright tell the emperor his chosen name was too plain, so they tactfully suggested, "The child is still young, perhaps we can start with a nickname, deciding on the formal name later isn't too late."
The emperor agreed, thinking he might find better names in the future. It wouldn't be practical to keep changing, so better to wait.
"Let's settle on a nickname for now."
Nicknames didn't require such careful consideration, after all, only family would use them. Even if they weren't ideal, it's unknown to outside persons, and finally, after some discussion, they decided.
The elder brother would be called Li.
