Sure, there’s no doubt that Mozilla has influence. What’s important to me, personally, is that they cannot
dictate what happens. And we have non-theoretical examples of where that’s the case; Servo would have really liked some form of inheritance to model the DOM, but the team overall said no. Also, note that the core team doesn’t make most of the decisions, unlike core teams of other languages. They also have a minority of representation on the language team as well.
And, as someone who was involved before, during, and after working for Mozilla, Mozilla just plain doesn’t have interest in really guiding Rust development. If anything, it’s diminished over time, after all, when Rust started, it was sponsored by the CTO and a director, both of whom eventually left, but also that thought it was important for Rust to be as independent as possible.