"Nakama Mode"? Is this the "Phoenix" form he got after his teammates found out about him?
Also, since Leo was beating him during the "training", what happened to convince Leo to finally accept Mebius as Earth's defender?
Finally, you stated that UltraSeven had bested Glozam, but decided not to kill him, to teach some sort of lesson. What was that lesson, since Wikipedia implies that Emperor killed Glozam instead?
Ah, I see you haven't seen the show.
I refer to Phoenix form as Nakama Mode because...well it is empowered by the feelings of his friendship with his human teammates. He literally gains power from friendship.
Mebius stepped up his game and learned the ability Leo taught him-his second strongest actually. It was that determination that made Leo deem him worthy to stand on his own.
Seven wanted the humans to kill Glozam-not anyone else.
Specifically he wanted one of the members, glasses girl, to do it.
I'll give a run down of how that worked.
Due to the last episode the guys are out of commission and the girls are the only ones up and ready to fight, except obviously Mebius.
Mebius fights Glozam...and just gets slaughtered, eventually getting skewered to a dam and frozen solid. Glasses girl, who was there at the time, is breaking down because she thinks he's dead.
Cue UltraSeven as a JAPANESE COWBOY (I love how random that is) riding up to her on his goddamn horse and taking her into the woods away from the battle field, where he tells her of how past Ultras have faced defeat like this, specifically himself, and how the Ultra alone cannot do it all themselves-they have to stand with their human partners.
He assures her Mebius is still alive as well and sends her on her way. Keep in mind, nothing is stopping him from just jumping in and saving Mebius right now.
So Team GUYS formulates a plan, using the beam that was used to revive Seven way back when, to revive Mebius-and modifies some of their existing tech to take Glozam down once and for all.
They fly in, and Glozam shows up. After nearly a minute, Glozam almost destroys the ship that's going to heal Mebius, only then does Seven himself step in.
Which is in character for Seven-he possibly more then any other wants the humans to stand on their own feet and be equals.
Seven then beats the crap out of Glozam while they revive Mebius, Mebius joins in, and Seven assists Mebius' Mebius Shoot with his fore head beam, blowing Glozam to pieces.
This allows Glasses Girl to fly in and evaporate the ice creature.
Notably Seven could have easily used his Wide Shot, instead of the forehead beam, and Glozam would have died-or he could have used the Wide Shot AFTER.
But the lesson he wanted to stress-humans can stand on their own.
Enpera had nothing to do with this episode-he killed Mephilas in the next though.