well its not like its most obvious thing in the world he never displayed healing abilities and he got stabbed by a blade, not given a new face like madara its safe to assume you need a certain amount to invoke the technique a blade volume of hashi cells maybe even less cause kabuto also use med ninjutsu to help heal probably isnt enough to regenerate anything noticeably, and its not confirmed yet even if he did i read over the manga on this and kabuto does say he uses his knowledge of hashi cells through his studies, in the anime the translation is different but goes along the line of kabuto tinkereing with hashi cells. Also he doesnt have jugos powers kabuto was healing him not splicing in random pieces of DNA if he had jugos hed get sakons and ukons and kimmimaros and anyone else kabuto had absorbed, on top of that not everyone can use this power yamato for example arguably had the most hashi cells and never displayed healing powers or great stamina