There is also, um,
this one.
And now I just remembered.
I've seen a couple of Guardians die while waiting in the ogre tower from Boomer splash damage.
Yes!
What if as soon as the map starts someone runs to the ogre tower entrance. That person would then:
1. Make orbs
2. Hop on the ogre doors and draw Boomer aggro. Shooting the floor would help.
3. Bonus points if they can kill, aggro or stagger the Swordbearer. Not really necessary since everyone else should be sniping the Swordbearer.
4. Bonus points for Striker Titans since they can blind the Swordbearer in case head shots fail to stagger.
5. With enough DPS one person can go to each tower and make doubly certain Boomers never bother the sword carrier.
It just takes 1 orb for the Sword Carrier to Super on the second kneel. If one orb remains then the sword carrier doesn't have to risk anything running back to 'safety.' They can hide on the ogre doors as well.
4 Heavies + 3 into super cancel should be an easy safe kill before ogres.