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The seed was full...
After devouring the Sentient Lightning Source, the little bit of gap needed for it to become full was filled. The lightning source tried to fight at first. Despite being easily absorbed into the seed itself, it didn't mean certain death. In some ways, it still had a chance to escape or in turn, absorb all the lightning energy on the seed.
Well, as if Vendrick would allow something like that to happen. Though, it was quite fortunate that nothing disturbed him during his attempts of stripping the lightning source off of its sentience. Vendrick didn't need it to be sentient, leaving it like might have a risk in the future, and for someone who's creed is to be cautious of his every move, there is no way that Vendrick would let it be like that.
As a result, the lightning source was absorbed without no problems. The seed is filled with all the necessary energy it needs to germinate and slowly transform into a Dragon's Heart.