A character with only half of these boxes checked could get in over a character with a perfect score
Of course, but Eventually if a character needs to be a strawhat, they will get all the 10 Pillar, its inevitable, simply because that's how strawhat are written and thats how to write good story. but the point of this is to predict a strawhat.
Its not exact science but we can get close to the truth here. Like you seen, I'm willing to evolve. Meaning that if someone comes up with a better list, well, I'll abandon mine.
I'm sorry we can't be satisfied by sayin "yeah a strawhat needs a dream, a post and a backstory", its too vague, and its not necessaraly true as a backstory is just a tool. We must go beyond, be more precise.
Is Bonney a a worthy candidate?
She fits all the first rules so yeah. Now, she still has a little bit of way to go to go in front of Carrot.