While going through some papers in my research area. I have noticed the presence of an author X with a high citation record (+3000), on several research papers. Digging deeper, I have discovered that, in addition to papers in my research area, X has published other papers dealing with problems in applied mathematics, physics and computer science. Moreover, most of these papers have spent two months in the peer-review process, which is rare when it comes to fields such as pure and applied mathematics.
As it turns out, one of my former colleagues was a co-author on one of the papers. After asking him about X, expressing being impressed on how a researcher can master different fields at the same time, he informed me that X rarely does any contribution in the papers that they're co-author in and that the other co-authors basically add him to increase the chance of the paper being accepted in the highest-reputed journals and shorten the period of the peer-review process, basically since X is known within the scientific community and has many Editor in Chiefs as colleagues. Furthermore, he told me his personal experience of one of his papers being rejected by a reputed journal without giving any feedbacks on the reasons of rejection. Later on, after adding X to the list of co-authors and submitting the paper to the same journal, it was accepted.
This raises the following question in my mind:
Does adding a researcher with a high citation record and influence affect the peer-review process (acceptance, period of peer-review, etc.)?
Remark: Note that I'm note questioning the validity of the results of the papers co-authored by X, but rather the possible influence they might have on the editors, which may affect the peer-review process.