FEH Easier to get 5 star if they are 5 star focus?

Really want Ishtar and Linde. Do the chances double to get them if they are a focus unit for a particular banner as opposed to if they are in the five star post but not a focus? Having a really hard time getting them. Reds and silvers pop up usually with no blues or greens. Also, what events are they usually apart... show more Really want Ishtar and Linde. Do the chances double to get them if they are a focus unit for a particular banner as opposed to if they are in the five star post but not a focus? Having a really hard time getting them. Reds and silvers pop up usually with no blues or greens. Also, what events are they usually apart of? For instance Ishtar was just in the last banner of "Heroes with odd wave skills". (Spent 80 orbs didn t get many blues let alone her)
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