Tancred and the Calixis Conclave
Despite his many great deeds in Calixis sector during the height of his active career, Tancred is an outsider amongst the other members of the Calixian Conclave. He arrived from far-away already a full Inquisitor, and never did try very hard to find his place. Instead he did as he pleased, earning many enemies in the process. He early rash actions may be the true reason why he has never been made a Lord Inquisitor; he is definitely among the most experienced and influential Inquisitors, but he lacks any form (well, he has some, but not as much as he should have had, were he a political animal) of backing in the Conclave.
Tancred is, however, part of the Calixian Conclave and is even nominally counted as part of the Ordo Hereticus. For the most part he relies on his own extensive cadre and his own web of contacts and informant, working with the rest of the Inquisition only when needed. While many senior Inquisitors have extensive cadres, possibly handed down from master to master over the course of centuries, Tancred's cadre is quite unique in Calixian terms – and rare enough even in the larger galaxy. Certain Interrogators in the service of other Inquisitors are even jokingly referring to Tancred's cadre as the 'Ordo Tancredicus'. While that is clearly and exaggeration, it contains a grain of truth – Tancred does as Tancred wills, still to the great frustration of he peers.
For all his resources Tancred cannot be everywhere, at least not all the time. Instead he relies heavily on both mundane intelligence gathering and divinations performed by himself, intending to detect potential threats early enough for him to dispatch a team to deal with it. In this he has been somewhat successful, enabling him to deal with threats emerging far away from his normal haunts, using either resources based in the Haegum or a local sub-sector office.
One final thing deserves mention; secrecy. Tancred seems obsessed with secrecy and security, preferring under-cover work and surgical strikes to more over methods. This hallmark has, couple with the above modus operandi, given many unusual successes in the field.