I learned years ago with chain driven motorcycles that chains don’t stretch. I know it’s a term we all refer to and many may know it actually elongates, It’s the pins and rollers that wear due to inadequate lubrication so then they made versions with o-rings, then x-rings, special alloys, special grease etc etc. The sprockets teeth wear, get wallowed out because the chain gets elongated. Taking steps to deliver adequate oil to the timing chain helps. I drilled a hole in one of the cam retainer plate bolts (does it help dribble oil to the chain? no idea but people here said to do it, seems like a good theory) and the tensioners plate I’m running has an oiler tab directed towards the chain. I ended up reusing the Summit billet timing set (same as Jpar shows) on a cam swap a few months ago and noticed the chain had pretty much the same play when I first installed it over 4 years ago, WITHOUT the tensioner in place during degreeing.