So a sharingan user can copy sakura medical ninjutsu ? He might be able to copy medical ninjutsu
but can they be on the same level at the likes of sakura ?
Also can they do the byakugou and heal over 20,000 if they wanted to ? Because its not KKG
Good question.
Medical ninjutsu is similar to elemental jutsu. It doesn't fall into any of the regular element types like wind, water, earth, etc. It's in a different category of elements which is the binary set: either light or dark (yin or yang). I think Medical jutsu is light. Shikamaru's shadow jutsu is an example of dark-type.
Since one of the sharingan's limits in being able to copy jutsus is that if the user has no affiliation to the proper element to be able to perform it, the sharingan user can't copy it. So for some sharingan users, they might not be able to copy Sakura's medical ninjutsu.
Yes Copy ninjas can acquire the jutsu and be able to perform it with the same level of skill as the person they observed. But the byakugou requires storage of chakra over a period of time. Sakura's took three years. I don't know if the three years was due to Sakura not being a chakra power-machine or if the three years is a real fixed requirement. If it requires three years, then the sharingan-user would not be able to use the tech and heal people at Sakura or Tsunade levels until they have their byakugou charged up.