I know this may be only a guess, but I think Fujitora is an admiral.
As we know, all the admirals (expect Sengoku and Zephyr) have nicknames of a color and an animal
- Sakazuki - Akainu: Red Dog
- Kuzan - Aokiji: Blue Pheasant
- Borsalino - Kizaru: Yellow Monkey
Since Fujitora means "Wisteria Tiger" (Wisteria being purple), I think Fujitora may be an Admiral.