The philosophy he might align himself with would depend a lot on his experiences, background, mentor, etc. An Inquisitor who used to be a Rogue Trader could follow any of the main Inquisitorial philosophies, or a minor one, or none at all. Or he might, if he's been an Inquisitor for some time, have followed a number of different philosophies at different times in his life and career.
In other words, if you want him to be a Recongregator, write his background to lead him to that way of thinking. As long as there's a coherent story about why he believes what he does then it's entirely up to you.