As Simon Sinek points out, often C-level executives are like monkeys up in a tree. They’re up there hanging out and having fun, but from down below them, all we see are a bunch of asses. (I'm heavily paraphrasing here.)
Good ideas and input come from anywhere. Be aware of how the people around you feel about you and your leadership. If they feel like they’re integral to the success of the project, they will be more open to sharing ideas and giving input.
If they feel like they’re mindlessly working as a cog in the machine, they’ll stay out of the way and you’ll have less happy employees and many less great ideas.
Be cognizant and be open to all the good ideas.