If it's not going to become 'unraveled' by wind whern in operation iy should be replaced, if not and the wood is fine ignore it. If covering, painting, whatever to one blade the other will have to have weight added in the same place Balance is a very important thing.
While carbon fiber blades do look cool until a flyer is no longer a novice by any measure they are a waste of money. Some willl elect to go w/cf blades w/ all sorts of rationalizations . No biggie, it's their money, the point is just if we're talking about a begineer carbon fiber blades don't do a thing to advance the learning curve of the pilot.
They ARE cool though, no doubt
. Doug