The Whole North Into Gaul

[Flavivs Aetivs]

True, but he didn't ally with the Romans at the point Justin suggests. Although not loyal to Libius Severus, Aegidius was a part of the Empire still and I doubt the Romans would have mounted a military expedition against him when Ricimer had other threats like the Visigoths. After all, it was the Romans in Italy who sent those Britons against the Goths at Bourges and Deols.