I doubt that Kinzo would be buried in the garden.
1: The garden is in a rather visible place. At the very least, the guesthouse, Kinzo's room and the honored guest room overlook it; I think the parlor does as well. Hiding something there stands a good chance of being spotted.
2: Why is only one rose wilting?
3: Roses have big roots. Digging around them without cutting them is pretty laborious.[/spoiler]
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