Second, this translation is taken directly from a one of the genki textbooks.
私は後輩に好きな人の電話番号を調べさせます = I make/let the junior students search for the number of the person I like.
My question is, why does this sentence refer specifically to the person that the speaker likes? Could this sentence not as easily be made to mean I make/let the junior students search for the number of the person they like?