Boruto always considers Sumire's words
My favourite thing about Borusumi has to be that I like seeing Sumire get down to business whenever there's anything she realises she can help Boruto with, she will not hesitate or pause. She also doesn't wait for Boruto to acknowledge it, she directly puts the ball in his court. If he wants to do something about the information its all left to him.
That freedom to choose what to do with her information is why I think he really considers Sumire's aid and words. Or at least is not hostile to her help, the way he is to Koji's "help"
Above, she checking on him, while he's a little on the edge, even if he knows she's on his side, its their meeting after a long time. Really appreciate Sumire for her calm demeanor here. She never lost her cool around Boruto, her crush, in the manga.
He reaches out to her to fix his sword, and after fixing and improving the sword, he listens to her explain the clauses and the limitations on the sword she fixed. In spite of having a crush on the guy, she's all business here. I love the professionalism! Its shown really well here that having romantic inclinations is alright but as a character you serve to further the plot.
I am sure that over their interactions in TBV, Boruto's trust and confidence in her grew after the way she explained Hidari's motives to him within minutes of seeing his behavior. This is a girl who is not privy to the information of the future like Koji is. She clocked it all by herself!
Which is why I think she is a foil to Koji. Koji has the blessing of seeing the future and how it might unravel, while Sumire forges ahead without any idea of what the future entails.
I see Sumire as an alternative to Koji. Someone who can estimate the future based on the currently available information she is privy to. Which is the reason she is the one to learn that Naruto is alive, that Amado recognises Kawaki as his own handiwork and the information Boruto shares with her.
Another thing that catches my eye is how she does not discuss what is in her mind much. She only builds on others thoughts and theories, which Eida can access with her Senrigan. No new thoughts or theories from her end, and it will prove strategic in her defeating Eida and accomplishing Shikamaru's mission for her.