You do realize that Kaze's death was avoidable, right? It wasn't that difficult to get an A-rank with him. Hell, he has one of the fastest supports other than the royal siblings and retainers (hence why Kaze's considered the Avatar's retainer).
At least Rhajat didn't do awful experiments on her child, if she's married to male Corrin. Rhajat's actually better in terms of characteristics than Tharja.