Reason I say so is because in my eyes the sumi displays the same characteristic as Musashi i.e a peppery one (my own terms) : one that develop from the outside to inside, one that consolidate lots of tiny freckels into a block of sumi later. this is different from say Shiro C which seems to have a sumi that is developed fron the inside to outside just like a typical showa. I will assume we have a better chance if having a tosai that display traits that imitate the way its oyagoi develop, off-course if we think the oyagoi is great and we want the offspring to be like the oyagoi.