Hi,
can someone tell me if my timming chain is ok?

There is a clip when first piston is in highest possition:
https://www.youtube.com/watch?v=pOLCdGEyDv8


And now when all pistons are in middle:
https://www.youtube.com/watch?v=demrz6VUtrg

Is it work correct or should I replace it? Is a tensioner work only after iginition?
Thanks in advance