Fire second guy. Train whatever you feel the 3rd guy needs because is your main primary trainee. The 1st guy can just get pops along with him because he is your secondary player. Personally I would continue training outside D and then go into some one on one for guards. (That will also help the 1st guys handling because it sucks.)
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs