[Mister Moose]

There is much that you can't tell from those photos, but even still I see numerous deteriorated areas, not just one. I see a finger joint separated with large gaps. And I again revert to the wood rot rule that what you can't see is more extensive than what you can see.

The boatbuilders test is to take a paring knife and poke around with vigor. Anyplace the blade sinks is trash. That exercise may reveal the extent of damaged wood to you.

Scarfing, epoxy (with or without polyester or carbon fiber), and sistering all have merit where the repair achieves the needed structural strength and is cheaper than ripping it all out and starting anew. Only you can make that judgement, but gather as much info on the extent of the needed repair vs the desired outcome before you decide.

Whew, this discussion makes me glad almost all of my body wood was healthy, about all we replaced were the mounting blocks and a few roof ribs.