Maybe you can blame Bronco for some of 2017, but the 2016 team had a ton of talent on both sides of the ball. I like Kalani a lot, but he didn't capitalize on what was available in 2016, and he didn't prepare your team for 2017.
And I don't care what Bronco left him, he lost to USU (6-7), ECU (3-9), and UMASS (4-8) that year. That's a combined record, excluding the BYU game, of 10-24. Bronco wouldn't have lost those games.