As we know Sasuke in Part 1 and Part 2 had the Curse Seal, but wasn't aware about Senjutsu or Sage mode until he battled Kabuto. Sasuke has seen how powerful Sage mode makes Kabuto, Hashirama and Minato yet Sasuke never bothered to learn or train for Sage mode.
Itachi and Kabuto practically told Sasuke the location to train Sage Mode, Sasuke can always ask Kabuto for the details of the location, yet doesn't.
I am sure after VOTE 2 Sasuke has greatly surpassed Kabuto, Jiraiya, Minato and Hashirama. Sasuke should in theory have enough chakra and stamina to learn Sage Mode.
Itachi and Kabuto practically told Sasuke the location to train Sage Mode, Sasuke can always ask Kabuto for the details of the location, yet doesn't.
I am sure after VOTE 2 Sasuke has greatly surpassed Kabuto, Jiraiya, Minato and Hashirama. Sasuke should in theory have enough chakra and stamina to learn Sage Mode.