Improvement is better.
If you really think that the information that @illustro pointed you to would improve your answer, definitely incorporate it. We want to create the best resource possible for the millions who will come after the original querent, and we know eyeballs drop off exponentially as they travel down the page. So, by all means: get the best info into your answer.
In cases like this I've made explicit reference to the answer that helped me improve mine, along the lines of:
Here's my thinking. Here's my explanation. @illustro points out in [their answer] (link) that "much better evidence here!" (Thanks, illustro! And you, Dear Reader, should definitely upvote their answer if you liked mine. I did!) Continuing my answer....