JTR,
I think Firewall's original point about SFO's really referred to the quality of Relief Commanders; a point often made in the company. There is no requirement to have any number of years experience to be a Relief Commander.
Many pilots know SFA about Freighter Integration and I give you credit for admitting it, however your ignorance could be to your detriment as people join after you with more/similar/less experience but pick up Relief or Commands before you and you wont know why, or wont be aware that a timely email from yourself could have protected your position.