amarv1994 ... when the bike moves through it's travel the chain will stretch, if the chain is too short it will stop the bike from being able to move through the travel. it does not matter if he has a chain tensioner or not.
I would understand if it was without it, The chain would be so tight. But the chain has enough give too it too use all of its travel because the tensioner moves, the chain isnt completely rigid
But its linkages are unusual !