At the forefront of the Las Vegas Raiders' issues over the past several seasons is their constant rotation through head coaches and general managers. Not only does this lead to majorly retooling the roster every offseason, but it also severely inhibits the growth and progression of young players.
This is especially true for late-rounders or depth pieces, as it is difficult for the new regime to come in and see what the vision was for said player. Either that, or a player was selected because they could fit into a system that is no longer being used in Las Vegas.