I feel like this is about Robert more than Cease. Cease is a foregone conclusion barring some massive crater in his game in the next few weeks. Collins could be a guy but I think they want to see him pull it all together first.
Robert has been making the game look easy, albeit in much lesser competition. But if he is moved up and continues to make the minors look bad, then they have a decision to make. And honestly not many major league roster options are blocking him if they should choose to bring him up.