Pretty much just bragging rights for KDP, and to possibly establish themselves as the best 2nd place team. Looking forward to the next phase, 6 of the eight teams are pretty solid.
It really bothers me how OGN stacked this group for Rogue and AOD when it seemed like they would've made playoffs in the other groups. In general the other groups don't even compare in overall skill level. 3 out of the 4 teams have the same W-L record now but only 1 of them is making playoffs even though they all lost head to heads with each other (Rogue to KDP and KDP to AOD and AOD to Rogue). Number of maps won should be rarely used to determine who makes playoffs and yet that was a given for this group from the beginning. Hopefully next season it doesn't happen.
It's likely to happen again unless they change the way they make groups. Only the previous season's 1-4 teams are seeded, the rest are randomly placed so the chances of getting at least one group with more than two strong teams is high.
But yeah, had Rogue or AOD been placed in groups B or C they may have made out of this phase. However I strongly believe that neither would have made it past the double elimination format of the next phase considering the strength of the top teams right now.