Recently, while reviewing late answers, I've noticed a latecomer.
The question was asked few years ago. Person who asked has accepted some answer(which in detail explained how to solve the problem). After few years, our latecomer decided to answer the question, too.
And it'd be fine if he provided some meaningful input, but I think his input wasn't that great: (from now on, I'll refer to Accepted Answer(er) as AA)
Firstly, his answer was less accurate version of AA(not a copy, but you would already know everything from the accepted answer).
Secondly, his answer was rather poor; The language wasn't as precise as AA's, instructions weren't as clear as in AA. They might even be a little confusing; not misleading, but surely not as easy to follow as AA's.
And thirdly, question had already an answer, and was asked few years ago.
Third argument isn't strong - any solution that wasn't listed is valuable, as it might help someone(and actually be simpler to execute); however, the fact that he didn't show any new solution or didn't explain it in a simpler way makes me feel it's just redundant and unnecessary.
I didn't know how to react. From the style I knew that asking him to refine his answer wouldn't help much; I also didn't know how to edit his post, since the best version was already in AA. Should I just leave it there as 0-score answer, flag it somehow, or ask user to take some action?