I tend to agree with sentiments shared above. And I do especially agree with Myton and Hiren’s responses.

I believe that there should be a hierarchy of sorts.
Starting with a knowledgeable and communicative manager. Someone who understands the strengths and weaknesses of their team members. And is capable of positioning their team member in such a way as to utilize their talents and approach success.
Next, their needs to be technical experts. Without sufficient technical knowledge, projects can become stagnant and problems insurrmountable. I also believe that a diverse team of technical experts can help to overlap areas of expertise in approaching projects. Finally, there needs to be people with knowledge of regulations and specifications that need to be met. These individuals can help to discern that the goals of the project are being met as described in documentation and according to the regulations of external agencies.

From my own personal experience, the qualities that have been the largest determinant of the success of a project have been technical knowledge, diligence, and communication. All three are vital to success as it is impossible for any individual to know everything, and when information is not readily known, it is critical to be able to search it out (through research or experimentation). And communicating all of that to each other is vital.