I was actually thinking of doing the exact same thing, xD.
If it's your ONLY Saias, and you have no intentions of using him, then I say fodder. He'll probably get a re-run, allowing you to get another Saias, in the future.
It will come along. Have patience. Unless you don’t plan to use Saias, patience shall reward you.
To answer your follow-up, if you don’t plan to use Saias, kill him to grant Felicia more power. He will have a revival in the future, so another copy will come along.