Cam chain tensioner play

Just double checking something before putting the head back on this 1975 Z1. The cam chain tensioners (small black sprockets) seem very loose, a lot more side to side play than I would expect. Is this normal? Video link:  youtube.com/shorts/yviIkk0yetI?feature=share

 

You should replace all of them. 

Yes it looks like the rubber dampers between  the sprockets and the gear are separating. As Steve said, replace them all. I would recommend the Liska solid billet gears - no rubber to separate. Some say they're a little noisier without the rubber damper but I haven't noticed much difference. Check the front cam chain guide and the tensioner roller too. 
You don't need that bomb waiting to ruin your engine.
And while it's open it won't hurt to clean those piston tops too if you haven't already planned to.