I wouldn't give much importance to it, the only problem I see is the amount of visibility this kind of contribution have. I think it should instead be only a sm

I wouldn't give much importance to it, the only problem I see is the amount of visibility this kind of contribution have. I think it should instead be only a small footnote. It's an edit, we can't assume the editor contributed significantly to the answer. If the editor had a better answer, he should post an answer himself; if he had a minor but still significant contribution, he should post a comment complementing it. An edit is IMO the lesser of the contributions, only grammatical and spelling corrections, and a name attached to an answer as an edit means barely nothing to me.