As a former Developer Relations engineer at Google, I can also say with confidence that companies want to speak to the creators of things. They want to talk to

As a former Developer Relations engineer at Google, I can also say with confidence that companies want to speak to the creators of things. They want to talk to engineers and PMs of the project rather than other people teaching on those things. For example, it was great when I held a meeting to talk about Android Camera APIs. However, partners would get really excited when I could bring those camera engineers into the meeting or talk. I am not saying one is superior to the other. However, I know for sure that companies would pay $$$ to have direct engagement with the "authority" on a project.