Saki has limited uses imo i have her and usually substitute her for something else even though she's a black unit and i spent time leveling her, plus you have sybilla, when her awakening comes she does almost the same thing but better. I would recommend spending 200 dc on awakening spica and iris and keep 100 just in case the unlikely tp rotations come around or princess awakening comes early. I have only used 2 HA in my main account plus bernard is gold and a guy which is a big no no for me haha