A friend and myself were having a debate on the relationship of the two, specifically with regards to passage. I am under the impression that an Inquisitor can requisition travel from the Rogue Trader and he is of the opposite opinion.
I believe in the Eisenhorn trilogy Gregor arranged an agreement between the two, and eventually Tobias just started helping him of his own freewill, but there is a passage in their initial encounter stating that he could have simply demanded to be taken to his destination and the Captain needs to comply but he chosses to not work that way.
What do you guys use/think?