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When you release the chain tensioner and remove it, the cam chains are going to go slack. Pressure from the valve springs and cam followers are going to cause the cams to move in relation to the crank, throwing the cam timing off, which is often disastrous if not reset properly. By putting the crank at TDC, then locking the cams mechanically, nothing can move, so when the tensioner is returned, everything is where you left it. This is the exact same procedure used when the IMS is changed, and for the same reasons.
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