Should be pretty easy to determine which one is making the racket once you get a chance to dig deeper after work
Uh oh.
So that vid clearly shows the noise coming from the tensioner pulley now that I listened to it. And "stethoscope" 24" 3/8" drive extension absolutely to my ear drum confirms that after testing tonight.
However I did stop at the parts store on the way home to get a replacement idler pulley for the left of the alternator. I def felt play in that . Pics. This explains the rust streaks on the intake tube and belt. Hope to get the ribbed, flanged tensioner pulley tomorrow after work. And post up some better vid and sounds.