All Lin Yuan needed to do was prepare spirit fluids and feys in advance and use Star Spirit Seat to transfer them to Bu Po when the time was right.
However, in order to do this, he needed to find an explanation that Bu Po could give to the Spirit Mother about how he managed to nurture his fey to the point that it was even strong enough to defeat Ling Mo, who had help from two Sky Mother families.
As the head of the Spirit Mother Federation, there was no way that the Spirit Mother was dumb.
Furthermore, as a Class 5 Creation Master, the Spirit Mother would have a good understanding of Bu Po's current Creation Master level and know what he was capable of. If he demonstrated powers far beyond his current capabilities, there was no way that the Spirit Mother would hand over the position to him.
This thought gave Lin Yuan a headache.