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There's a lot of guys that lock it at TDC with a pin or drill bit (5/8?) and proceed without the cams locked changing ONE tensioner at a time.
Doing without the cams locked has the small chance that a bit of tension released when removing the tensioner may slightly adjust the camshaft position in a worst case scenario.
I suspect this would be more of a risk with a high mileage engine where the chain is older and stretched and the guides have wear.
Certainly others will comment and either support a simple TDC lock, or the full-on lockdown recommended by Porsche...get ready lol.
FYI...If anyone tells you timing chains don't stretch, they are full of ****************.
Good luck.
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