If Sitake ever did leave. Bronco was a DC for a 4 win team when BYU hired him. KS was DC for a 3 win team when BYU hired him. Both of them are great leaders (though styles are very different). Any former player that is a member, or member that is a great leader that has coordinator experience would be a candidate despite any sort of poor results.
Lance Anderson
Aaron Roderick
Morgan Scalley (I know, I know)
Dr Bob
Nick Howell
Others who have worked at high P5s
Vic Soto
Justin Ena
Shaun Nua