Meredith being put on a choo choo train to insane kudos to the lyrium ex machina still upsets me. I remember reading that we were meant to get more shades of grey but instead we got more shades of crazy. I know most of it was a result of time constraints but I hate how Act 3 panned out with regards to Meredith and Orsino, lol.
I don't see how Samson has anything to do with that story of Cullen's. Unless there's some context that I'm missing here.
Because it really seems something Act 3-Meredith would do. Not so much Act 2-Meredith and definitely not her Act 1-self.
Samson was the Templar delivering the letters between the mage and his lover. That's why he was kicked out of the order.
His dismissal occurs prior to Act 1 though (since that's when we run into him) so it's well before Meredith got her hands on the lyrium idol.
It's neat that it's that same Tranquil that we come across in Inquisition that commits suicide rather than betraying Samson in the quest where we go to discover how to destroy Samson's armour.