Rogla will mostly be there, that is his role, the rest the road will tell. It's not like team Slovenia can dictate on how other nations ride. In general harder other nations ride more likely for Pogi to attack on Kigali, more tactical games other nations play, more likely Rogla to suck some breakaway. Softer they all ride more likely for team Slovenia to result to numbers game near the end of the race.
So basically what should somebody do is rather pointless, as it depends on the circumstances. Each team member will cover some attacks, that is almost a certainty, beyond that it will be the rumble in the jungle.