Rule 5 eligible guys as far as I know (from Fangraphs). Not 100% sure all the guys here are eligible so please do correct me.:
AAA- Nick Kahle, Freddy Zamora, Isaac Collins, Chavez Young, Noah Campbell, Evan McKendry, Garrett Stallings, Harold Chirino, Nick Bennett, Nolan Blackwood, Wes Clarke, Chad Patrick, Blake Holub.
AA- Darrien Miller, Zavier Warren, Andy Yerzy, Ernesto Martínez Jr, Felix Valerio, Eduardo García, Casey Martin, Carlos D Rodríguez (OF), Coleman Crow, Adam Seminaris, TJ Shook, Brandon Knarr, Justin Yeager, Sam Carlson, Ethan Murray, Logan Henderson, Shane Smith, Russell Smith
A+- Ramón Rodríguez, Jesus Chirinos, Jheremy Vargas, Eduarqui Fernandez, Terrence Doston, Yujanyer Herrera, Edwin Jimenez, Alexander Cornielle, Stiven Cruz, Tayden Hall, Yerlin Rodríguez
A- Blayberg Díaz, José Acosta, Miguel Briceno, Jeferson Figueroa, Quinton Low, Alexander Valencillo
Guys that I think could be protected in the MLB phase- Collins, Campbell, McKendry, Stallings, Chirino, Clarke, Holub, Henderson, Yeager.