The only reason SS isn't after Kazaki is because Ichigo is to powerful.
if Ichigo was powerless I have no doubts they would be trying to kill that kid.
Either they don't know the kid is a Shinigami, or it is another one of those "Nakama are exception" deals that is stereotypical of Shounen. Just helping a certain group of people in Shounen is enough to immediately acquit you of all past sins (if you are a villain), or make the protagonist the "lord and savior" of any people he has helped, saved, or fought alongside.
That is the situation we get with Ichigo, whom Gotei 13 Shinigami that knew him were begging and hoping earnestly for him to save them in the first invasion.
With the irony of that being how Ichigo didn't even do anything. In fact, his arrival prolonged the stay of Yhwach, who was already set to leave. Ichigo couldn't do a damn thing to Yhwach throughout the entire story arc to hinder him until Aizen and Uryu stepped in during the rushed ending.
Edited by Saiyan5nine-tails, 19 December 2016 - 01:40 AM.
Bleach - Beyond the Pages
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"On the Second Day,
The Beast Awakens,
With its single fang,
It swallows the falling star"
[B][CENTER]A bond that transcends their feelings and lies; the willingness to put aside differences for the other's safety; an undying respect and caring for each other. Black and White; Yin and Yang; Shinigami and Quincy.
Kurosaki Ichigo and Ishida Uryu