Chain Tension and Bottom Gear

Was hearing some noises that I wanted to investigate so pulled the chain case on my Alpha. The chain seems loose to me, can push it in about 1/2" to 5/8" on the long side. Anyone know the correct spec for this? The plunger (the spring loaded piece that locks into the serrated groves to hold tension) on the auto-tensioner pushes in far enough to where the solid part of the tensioner (where the plunger slides into) will hit the serrated groves that tension the auto-tensioner. That's the "click" I was hearing...

Also notice lots of galling on the bottom aluminum gear after right at 100 miles. More than I remember seeing on my '16 after 1,000+ miles. Any dealer on here know if the tensioner is supposed to push in that far and or be tighter? Or if the bottom gear wear will be called "normal" or should I bring it in and have it looked at?

I'd just bring it in, but it's fairly well tore down right now and I'm not ready to put it back together until I get a couple parts in...

Thanks. The noise I hear is the tensioner collapsing, don’t think there was anything else but will listen next time I ride. I can turn the secondary and see it contacting and making the noise. I put it back together and won’t worry about it.