In between the empire and terra, we don’t know the June 3152 owners of:
Thorin
Rigil Kentaurus
New Earth
Sirius
Ghara
Any of these are fair game to be held by Capellans, Wolves, or other by June 3152
EA map shows the Empire holding
Lipton
Zavijava
Xi Ursae
Graham.
So if the Capellans did drive a wedge, it isn’t a large one