None of them is Kieran. He does not appear and those stewards are made up as steward Barnes (who was responsible for Rose and Cal's suite) never existed.I know but which of them can be Kieran? Steward 2 Is that who is knocked out by Tommy. Steward 3 is that one with revolver. Steward 4 is punched by Rose. Stairwell Steward is who trying help Rose and Jack but panicked as he dropped keys.