Wait, In the first pic the pillar behind Gresh, It shows the Gresh seals from the My Lego Network (Seals used for the Glatorian contract). And there is 5 more, Meaning you can probably play as the others.
As someone said before about that they could be achievements, I think they are attacks of some kind.
And wait, Behind Gresh is Atakus, Near his feet in the distance. Now they have something to worry about.