Rayburn was an orphan; the Giradia family gave him a home.
The wise butler in Batman was called Alfred. Master Bruce affectionately called him "Rayburn."
He was like Alfred in the comics; loyal to the family. And he treated Wendy like his own daughter.
He also knew that the Giradia Group was recently on the defensive from Nathan Evans' treason, and its development was hindered since it was constantly under all sorts of investigations.
Furthermore, something weird also happened to the Group fund.
He was supposed to stay beside Wendy. Encourage her to be strong, and let her know she still had him as family.
But now it was time to leave.
He was old, and his eyesight was failing. Sometimes he even coughed up blood, and he almost fainted several times.
He could no longer get himself to stand at the door, waiting for Wendy to return, to remove her coat, or to pull away her chair before the table.