I'd remove nickel CB and add safety.
We have TONS of slotty nickel types. Kyle Wilson was a good nickel the year before. Sterling Moore would be a fine nickel. Damian Swann could do it. B.W. Webb is available. Calhoun, Hightower, etc. are also nickel styles.
I'd rather have new safety to fill the vacancy left by the likely retiring Roman Harper and put some pressure on Byrd and Vaccaro in negotations. With the Saints relying so heavily on three safeties, there's really nobody behind them should one go down.