Does this weapon work well on Jianxin too?

I love her for a long time, but since I don't have her teammate, I thought I could skip her. Now I realize I'd rather skip breakfast, lunch, dinner instead.

And yes it is a triple

Is there any evidence to suggest that pulling singles is a bad idea? I am mostly free to play and a new player. I am trying to get Both Iuno and her weapon, as well as Hsin and her weapon and I really can't be wasting pulls