My approach is: Action reveals character.

You know people by what they do. The plot is a structured device for allowing characters to make choices.
And their actions, especially in pressured situations, gives an insight into their real personality, which is what the audience want to see (whether in books or films or plays).

—mood
Moody Writing

IMO, you're over-complicating this.

Structure is how you tell the story. Certain things come earlier, some come later. Otherwise the story won't make sense and the audience won't emote like you want them to. For example, in Shawshank, Andy and Red have to suffer for a while before they get happy. Or, in The Sixth Sense, we learn Malcolm is dead at the end, not at the midpoint or page 30.

Plot? The specific details. Shawshank, Buffy the Vampire Season 5 and The African Queen all have the same structure but obviously different plots.

I don't think character, plot or structure are joined at the hip. Any of them can take the lead.

Just my two baht.

It's weird. I tend to see structure more closely related to plot. Structure is the order in which information and plot is revealed.

But plot is the obstacles a character must face to reveal who they truly are.

It's all intertwined. And I can see arguments for either side. But when I'm crafting a story, it works better for me to think --

"What's the best way to reveal plot to get the most out of my characters."

To me, that's structure.