[nicw]

You can be right - but your maturity is determined by your response when the team "comes around" to your idea. A mature developer nods, and immediately begins walking through their pre-developed action plan. That person has the confidence that the team knows there was a mistake, and no need to walk through the past.

An immature developer throws out the "I told you so" and lauds it over their team.

We all make mistakes, it's the foundation for the fail-forward-fast mantra. So acknowledge the mistake, impress others that you have a solution, and move forward.