Brothers in Arms, for me, was a really enjoyable mission in the LOTV campaign, and one that I feel could really be implemented into the Co-op Roster in a unique way.
This could be considered a "Raid" Mission, where certain requirements must be met before starting, you need one Terran and One Protoss or Zerg commander. (cant do with Two Terran for example.)
The mission would play quite similar to how the campaign mission works, where bonus xp is awarded for rescuing small outposts that grant additional ally units. The Terran commander would take the place of Raynor's initial base. and Valarian wont appear. There would be two lanes, like the campaign and most of the resource nodes would be the same.
Every so often, the Terran commander will be stunned, along with the Terran enemy, and hybrids will attack, and the protoss will put on defense of the Terran army, thus allowing the Terran to be kept alive. Terran Heroic Units, such as Nova, Hyperion, Swann's robots etc would be immune from this stun.
The other option is to make it a mainstream map, not a raid, and then instead of one commander getting stunned, it would alternate between the two commanders. First Player 1, then Player 2 forcing a bit more teamwork on how the bases are designed, but as well as how they incorporate there armies.
