The Lord revealed -
"...again, verily I say unto thy brethren, Sidney Rigdon and Frederick G. Williams, their sins are forgiven them also, and they are accounted as equal with thee in holding the keys of this last kingdom..." (Doctrine and Covenants 90:6)
I believe the wording "as equal" suggests that a unified quorum of presidency as a unit holds priesthood keys though only the President may be the only one that holds keys.
The Lord also warned -
"Be not ashamed, neither confounded; but be admonished in all your high-mindedness and pride, for it bringeth a snare upon your souls.
18 Set in order your houses; keep slothfulness and uncleanness far from you." (Doctrine and Covenants 90:17–18)
I believe this applies to all that have been given priesthood authority or leadership responsibilities.