The basic law of the author's signature is this. The later the signature, the less obvious its function and significance. Only the author with the top signature can reflect his ability level, and the published article can play an important role in personal promotion.
In China, the first author is the most recognized, and the promotion assessment score is the highest. If the paper is an ordinary journal paper, then the role of the third author is not great.
But if the article is a high-value academic paper, such as a paper published in top academic journals at home and abroad, then the third and fourth authors are also recognized. Generally, high-level academic papers are difficult to complete independently, usually by several authors or even teams. For this kind of article, the author can already prove his strength.