As of right now, Olrox is still in Neufchâteau as a kind of 'resting grounds' in between wide-area murder. He specifically avoids the Covenant because the Aegis was enhanced the last couple times he tried to enter it and the magi within killed its 'master'; he's a coward at heart, and firmly believes the players are enough of a threat to not be worth the effort.
Meanwhile, the old infernalist was originally a Strigae and was grooming a number of disciples, his lessons obviously cut short. At least one apprentice has some skill, one or two points in Debauchery, Effusion, and Phantasm; and has managed to make a sanctum within the castle have a perfidious infernal aura of 9 by 1228 through discrete rituals, and the rest of the castle is still at 4.
Based on the most recent events, how concerned should the players be in regards to their Oath? As I don't want the Infernal to be overly dominating the campaign, I'm going to avoid adding more threads. Which means no Mulhidun presence or plotting-oriented demons. Any further threat needs to be restricted to what can be brought to bear by the handful of surviving Strigae and the effects from the aura itself. Potential survivors, being human and thus able to exercise patience, can spend time 'underground' to marshal their power and not make an appearance until a decade+ from now.