I know it's a beat up topic but Jones has been sidelined for almost a year in the last 3 seasons when it comes to being available for games. He's just not reliable to be either a regular or rotational option. It's also never a good idea to put him on when he still recovering from his usual 2-3 months off. It's a better option to have a younger player who can create a competition and might even displace in the long term the regulars, whilst learning off someone like Toby.
Being able to provide cover for RB is also a plus considering we're not looking to buy another RB this Summer.