The exclusive goal of secondary networks is to provide a host medium for running more advertising. It comes down to what programming they can afford, not an original air date. This is evidenced by the list of shows presented in the OP where much of the programming is crime dramas from the last eight years that appear on numerous other networks.
They have to be careful about picking a particular genre and branding around it as there may not be the content to support it in the long term. There seem to be as many channels that have lost their way with respect to branding (Grit?) as are managing to hang on. For their part, Ion obviously visited a crime drama fire sale to keep programming going.