How does covering ally works in Final Fantasy Brave Exvius?

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I have a team of Ramza, Elza, Cecil, ExDeath, Minfilia.
For some reason, during my fight with Titan (the Raid Boss), Cecil would 90% of the time cover Ramza instead of Minfilia or ExDeath whose defense and HP are lower than Ramza. Why is this? How to make Cecil cover ExDeath or Minfilia instead of Ramza?
Ramza
Lv 100
HP 4343
Elza
Lv 100
HP 5122
Cecil
Lv 100
HP 4552
ExDeath
Lv 100
HP 3513
Minfilia
Lv 59~
HP 2929
Tell me if more information are needed.
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