Raven MTi2 doesn't need to be calibrated, however it can't hurt it to re calibrate. But this is different than being configured. Configuring the touch is important so the mouse will show up on the correct display when you touch it. The UPDD status should show that is it connected to monitor 1 aka the Main Display. This is more an issue with Dual or Triple Touch screens, or Windows PC computers.
also, the video says the Raven screen needs to be set to the far left of the iMac in monitor setup. why? why can't the iMac be to the left of the Raven, if the Raven is set up as main monitor?
It is best to have the main display to the far left, since anything to the left of the main display will be in the negative X Axis, so many apps and app windows will not know where to show up, or they will show up on the left display although you really want them to show up on the Raven display. But the fix is just to drag the window over to the main display.