I suppose so, but I have a hell of a lot of evidence to present at trial, whereas Vellos has a forged letter and some rumors that the High Ranking officials of Asylon have seen said forged letter.
Hireshmont also has a charming disposition. And the ability to pick the next Magistrate of Justice if he wants to. And the support of no small number of nobles.
And the fact that nobody doubts Erasmus' guilt now, and you've quite publicly admitted to at least being associated.