So long story short The 9th chevron is for oject in movement , no mater where the objet is . So if its the case they dont need the extra ( 9th ) chevron adresss to dial back to earth . Let me get that straight , 6 chevrons + point of origin = in the galaxie you are curently in and 7 chevrons +point of origin = an other galaxie and 8 chevrons + point of origin = to a moving object . But if the object drop out of FTL , it must be a 8 chevron to dial earth not 9.