Yes.
Corporate statutes allow for this.
For filling a vacancy, see:
617.0809âBoard vacancy (emphasis added):
(1)âExcept as provided in s. 617.0808(1)(f), any vacancy occurring on the board of directors may be filled by the affirmative vote of the majority of the remaining directors, even though the remaining directors constitute less than a quorum,
or by the sole remaining director or, if the vacancy is not so filled or if no director remains, by the members or, on the application of any person, by the circuit court of the county where the registered office of the corporation is located.
For the resignation, see:
617.0807âResignation of directors:
(2)âA resignation is effective when the notice is delivered unless the notice specifies a later effective date. If a resignation is made effective at a later date, the board of directors may fill the pending vacancy before the effective date if the board of directors provides that the successor does not take office until the effective date.
The sitting Director could appoint the individual back on the board.
However, they did resign.