Lombo/Espinosa/LaRoche haven't produced at a level to make a GREAT case.
Flores has been producing well enough to show us that he is what we thought, a good to great backup. He certainly hasn't made a GREAT case he needs to be starting.
Moore/Solano dont' have enough AB's to have made a GREAT case.
Zimmerman is a bit of special case, but certainly hasn't made a GREAT case based on performance.
The only players that have made a GREAT case to not be moved no matter what are in my mind Desmond based on performance, Harper based on projection/performance, and Zim/Werth based on contract.