If Cora wanted Kimbrel for the top of the order, he should have brought him in for 1 out in the 7th and 3 in the 8th and left Barnes for the 9th, in theory, for the bottom of the order.
If that's what he wanted, then bring in Kimbrel for 1 out in the 7th and 3 in the 8th, and you have Barnes for the 9th and, in theory, the bottom of the order.