system
Given the following post, respond as if you're commenting on Reddit:
human
[40k] Why was Yarrick not executed after Ghazghull released him?

Seems to me you can't even trust a hero who seems to have managed to somehow come to an arrangement with filthy xenos?

The Inquisition is not normally put off by the fact someone is popular. Did they investigate him and find him pure? Was he considered too useful of a tool so the Inquisition were, for once, happy to just keep a close eye on him until he actually did something suspicious?
gpt
The man has killed more Orks than some Space Marine chapters son. He has been killing Orks since before you were born. This isnt the Arch Enemy we are talking about, Orks dont inherently corrupt just being close to them. These are not those fancy space elves or fish people, you cant collude with them or make deals. Yarrick got lucky, or more likely, was so badass that Big Green himself couldnt let such a good fight end so easy. It is as simple as that, there wasnt anything to investigate.