You may be right and the that video showcases the tick well but not the deeper knock (sounds kind of like its a bad an exhaust leak). Is anyone aware if it the tick can become deeper if it totally fails?Sounds like a pretty bad pentastar 3.6 engine tick. Could just be the rockers need replacement if the cam is still in good shape.
This youtube video has an example of the noise on what appears to be an early detection of the tick, go to 2:00 to hear the sound. This is the same engine you have in the van.
Pentastar Engine Tick