Questions about authorship rank and academic politics Disclaimer! I am a first year CS/Applied math master student so I do understand very little in how academia works. I am trying to fix it before I go into PhD.



I have discovered a scientist who works in the field I am interested in. This scientists is very successful career-wise. The scientists finished a prestigious university and had stays in very good places. Now the scientists is an assistant prof in a high-ranking US university.

However, literally >90 %  of his papers were written in co-authorship (as a rule, not the first nor the last author) with other more experienced researcher who we recognized as leaders in the fields. In fact, the only solo paper the scientist has is ones thesis! All PhD students so far have been also co-advised.

I have very little research experience but it seems to me that coming up with a good idea one can further develop is the trickiest part. Implementation (or, sometimes, even writing down actual proofs) is a technical work. I guess that the coauthorship was earned for some implementation work. It seems to me that there are much more people capable of / actually doing these technical work both in academia and in industry who do not get such recognition as the aforementioned scientist.

I may be envy but I find very little proofs of that scientist actual skills. Instead I have a feeling that the scientist makes very wise political decisions or is good as self-advertising.

Also I did very limited empirical studies and found that researchers who have highly-cited solo papers tend to have higher (4K +) citation counts then those who have almost exclusively co-authored papers.

My question is many-fold:


is what I have described normal? Update. Is it normal to have almost exclusively co-authored papers?
what should I do to mimic that behavior. It does not seem to be noble at all but apparently this is how successful academia people work.
Are indeed funding and promotions based on citation counts? If this is not the case, how those researchers without solo papers are assessed?
Is it true that those researcher who has successful solo papers are much better supervisors?


Update. I am talking here about theoretical research in CS/Applied Math. I guess in other fields there are many more opportunities for equally valuable contributions of many sides.
I should point out one of the most famous of co-authors in math: Paul Erdős. Erdős never won a fields medal or even wrote a seminal paper as a solo author. What he did do was "wander" around to different universities and help people solve problems. He was an extremely prolific writer (over 1500 published manuscripts) and is considered one of the greatest mathematicians of the 20th century. The ultimate mathematical Renaissance man who could seemingly work on any problem.  I think you would have quite a bit of difficulty in arguing that because Erdős never wrote a classical mathematics paper as a solo author, he was not a tremendous mathematician. (Though to be fair, in the past decade, his paper "On Random Graphs" can now be considered a classical work of mathematics. It just took 50 years for the work to become highly applicable). 

I relate this story because having lots of co-authors does not necessarily mean having bad skills. Now I am not saying your professor is the second coming of Paul Erdős (I can't think of anyone currently in academia who can claim that mantle) but they might have other skills you are not giving them their due credit for. 

Never underestimate the power of being able to organize a group of smart people and get them to work together on the same problem. 

To answer your questions specifically-


It's neither normal or not normal. Tenure positions are rare enough that there are certain metrics that are highly predicative (e.g. individuals who are ahead of the publication curve for their field tend to get hired in tenure positions) but there is no conclusive metric. Individually, there is enough variance within each position that you cannot really say. 
Collaborate! Having only solo author publications is probably not wise (unless you are in a field that is big on monographs). Having a variety of publications where you are first author, second author, and a middling author show your ability to collaborate and be a team player. 
Yes, clout does increase likelihood of getting accepted. Being a big wig with 10,000 citations at an elite university means you are more likely to get a grant than someone with a handful of publications from an R2. But to be fair, the qualities that led that person to be a big wig probably translate into their writing and research caliber as well. 
I have never seen any research or evidence that suggests that.