@bejad007 Yeah, I don't deny that, but the most important thing for Sayu right now is to have a safe roof on top of her head. If Asami tried to replace Yoshida there, it would mean having Sayu, a runaway that could be reported to the officials at any moment, in Asami's home, which happens to be the home of her troublesome parents as well.
So, no, I wasn't trying to be sarcastically hostile, I was trying to point out the giant flaw in having Asami replace Yoshida. She can be her emotional support and ally, more so than Yoshida because there shouldn't be any weird tension between them, but she still can't offer Sayu the material safety Yoshida can.