Thanks Millet. My plans are to grow it and then T-Bud graft a Mature Fukushu bud to it next spring so I will have a Mature Fukushu kumquat on it's 'own' roots.
These 2 are Fukushu T-Buded to Flying dragon 6-22-2021
This is a Fukushu T-Budded to a sour orange with a PT interstock around September 2021.