It is not Senju DNA it is technique Lol you idiots... Sakura can do something like that also, you need to have very good chakra control to do it.. that's it.
Yes he is he had medical ninjutsu from his healing meaning his chakra control was top notch! add Senju body and the fact that he is a man.... He is much stronger.
You know this thread will probably end with hashi haters saying tsunade is stonger then her full blooded senju grandfather. Which is just like saying she has more life force then a full bloodied uzumaki with the most life force but hey.. haters gonna hate