With what we have seen this season, I think your assessment is interesting. I would slim down the number of options to make it more useable.
C: Leon, Vazquez, Swihart
1st: Shaw, Rameriz, Travis
2nd: Pedroia, Holt, Moncada
SS: Bogaerts, Hernandez, Holt
3rd: Moncada, Shaw, Hernandez
RF: Betts, Benintendi, Swihart
CF: JBJ, Benintendi, Betts
LF: Benintendi, Swihart, Young
DH: Rameriz, Swihart, Young
I kept the depth chart down, but Holt would be on the list on many positions if I went to a 4th option. I am ruling Sandoval out at this time until he can prove that he belongs. Putting Moncada in is a stretch at this time but the competition for him is weak and he is the #1 or #2 player in the minors this year. I think he will make it. I would get rid of Rameriz if possible but am resigned to the fact that his salary might make a trade impossible. Rutledge, Castillo, Marrero, Hill I see as trade bait.
No comment on pitching at this time.