My understanding is that Nicholas Sligh is the final member of Stanford's 2018 walk-on class to make that decision public. Here is a quick rundown of the 10 athletes in that group. I hope to have a conversation with Sligh soon about his decision to flip from Yale, but I included some comments he shared with me in February after he visited Stanford. He committed to Yale soon after the visit to Stanford.
https://stanford.rivals.com/news/stanford-will-welcome-10-walk-ons-to-the-program-this-summer
https://stanford.rivals.com/news/stanford-will-welcome-10-walk-ons-to-the-program-this-summer
