It is going to be interesting. I could see all four ending up in there somewhere. I could see a massive vote split where none end up in the top 20.
Right now, I'd list the following non-draft-picks as having at least a 20% chance of ending up in the top 20:
Hitters: Jeferson Quero, Tyler Black, Brock Wilken, Mike Boeve, Luke Adams, Jadher Areinamo, Luis Lara, Cooper Pratt, Yophery Rodriguez, Filippo Di Turi, Eric Bitonti, Jesus Made, Luis Pena, Jose Anderson
Pitchers: Carlos Rodriguez, Jacob Misiorowski, Logan Henderson, Shane Smith, Brett Wichrowski, Craig Yoho, KC Hunt, Josh Knoth, Bishop Letson, Manuel Rodriguez.
That is 24. Plus you've got a bunch of guys who could garner at least a few votes or at least deserve some consideration:
Hitters: Brewer Hicklen, Isaac Collins, Oliver Dunn, Dylan O'Rae, Eric Brown, Juan Baez, Josh Adamczewski, Juan Ortuno
Pitchers: Bradley Blaylock, Coleman Crow, Tate Kuehner, Yujanyer Herrera, Alexander Cornielle, Daniel Corniel, Enniel Cortez, Ryan Birchard, Yorman Galindez, Hayden Robinson, a bunch of non-Yoho relievers.