Will Downing buys the star DX3906 for Jin | 3 Body Problem

To my show only watchers, here is this scene where Will spends a ridiculous amount of money buying Jin a star. I mean he is dying and it is for a good cause (raising funds for the defence budget against the Santi, so good for him and Jin, I guess. It is a sweet gesture that really says I love you in an astronomical (pun intended) way.
To my book readers, we got a scene where Will buys DX3906 for Jin 😊 . Talk about a gift, huh? If you know, you know. No spoilers, but, do you think we have met AA yet? Which character is mostly likely AA?