The standard of perfection for cochins states that cochins should only have feathers on the outside of the middle toe and on the outside toe, so I don't necessarily think that more feathers is better in this instance.
"only"?
When I googled for the standard of perfection, I found this:
https://www.cochinsint.com/large-female.html
It says, "middle and outer toes, heavily feathered to ends."
Also, disqualifications includes, "outer toes not feathered to last joint, bare middle toes"
I read it as meaning that two feathered toes are the minimum, but more are fine.
I have no actual experience with them, so my reading may be at fault--but I understood it as meaning "we'd like to have all toes feathered, but that's very hard to achieve, so we'll only make it mandatory for some of the toes."
(And I am aware that standards can be different for large fowl vs. bantams, and in different countries, so I may have looked at the wrong standard.)
If you go to shows, I suppose you could enter this bird (after it's grown) and see whether the judge marks it up or down for the extra feathers.
@NatJ I'm unsure if I should breed it when it becomes old enough in fear of passing down the genetics for extra feathering. Any suggestions?
I would assume it could pass on those genetics--so you could breed it and see, or you could breed to a mate who has not-quite-enough feathering in hopes that it will average out, or you could just not breed it. I'd suggest basing the decision on how good the rest of the bird ends up being--if it's the best bird except for this, then use it; if others are better anyway, then don't use it.