Houston Astros preliminary prospect grade breakdown

I am working on the Houston Astros Top 20 prospects list for 2018. I might be able to finish it this weekend but with Thanksgiving and family distractions Monday is more likely. Here is the current breakdown of 73 grades.

Grade A: Zero
Grade A-: Two (note that these are both currently A-/A and may be straight A)
Grade B+: Two
Grade B: Six
Grade B-: Four
Grade C+: 15 or more
Grade C: A whole bunch

There are a lot of borderline grades and this breakdown is not close to final.

The players:

Jorge Alcala, RHP
Yordan Alvarez, OF-1B
Brett Adcock, LHP
Jonathan Arauz, SS
Rogelio Armenteros, RHP
Brandon Bailey, RHP
Jesus Balaguer, RHP
Carmen Benedetti, OF
Brandon Bielak, RHP
Ryne Birk, 2B
J.B. Bukauskas, RHP
Deury Carrasco, INF
Humberto Castellanos, RHP
Gilberto Celestino, OF
Randy Cesar, INF
Lupe Chavez, RHP
J.D. Davis, 3B
Ronnie Dawson, OF
Dean Deetz, RHP
Chad Donato, RHP
Jacob Dorris, RHP
Drew Ferguson, OF
Riley Ferrell, RHP
Reymin Guduan, LHP
Jandel Gustave, RHP
Elieser Hernandez, RHP
Nick Hernandez, RHP
Tyler Ivey, RHP
Cristian Javier, RHP
Jon Kemmer, OF
Carson LaRue, RHP
Carlos Machado, OF
Corbin Martin, RHP
Jason Martin, OF
J.J. Matijevic, OF
Jack Mayfield, INF
Brendan McCurry, RHP
Colin Moran, 3B-1B
Parker Mushinski, LHP
Freudis Nova, SS
Michael Papierski, C
David Paulino, RHP
Cionel Perez, LHP
Hector Perez, RHP
Joe Perez, 3B
Nathan Perry, C
Yoanys Quiala, RHP
Lorenzo Quintana, C
Chuckie Robinson, C
Elian Rodriguez, RHP
Leovanny Rodriguez, RHP
Josh Rojas, INF
Abdiel Saldana, RHP
Patrick Sandoval, LHP
Kit Scheetz, LHP
Kyle Serrano, RHP
Troy Sieber, 1B
Anibal Sierra, INF
Carlos Sierra, RHP
Miguelangel Sierra, SS
Jairo Solis, RHP
Peter Solomon, RHP
Max Stassi, C
Myles Straw, OF
Garrett Stubbs, C
Sean Stutzman, LHP
Trent Thornton, RHP
Abraham Toro-Hernandez, 3B
Kyle Tucker, OF
Framber Valdez, LHP
Forrest Whitley, RHP
Alex Winkelman, LHP
Stephen Wrenn, OF