...

Anyways, I have found numerous holes in your plan.

Urdar class enemies don't always spawn.

Ubers are resistant to slow and Decrepify, so it's not worth considering. Stun is reduced to a very minimal amount, so you need repeated stuns.

Infinity doesn't do crap so long as their resistances are above 100%, and the key to killing Ubers isn't CB, which is minimalized against the Ubers, but rather, Stun. All Conviction Auras are nullified as long as Mephisto's remains intact, unless yours is of a higher level.

The only armor your Mercenary should use is Fortitude.

I will agree that your resistances will suck without Hoto.

CtA should only be used by one person, and that is the person who has the highest total skills bonus, and a +6 BO CtA.

Teleport may be good, but beware all AoE attacks. of which the Ubers have plenty of.

Dusk Shrouds have a 77 Strength requirement. Archon Plates are 103.

A pincer attack won't work, unless you have a target that can move at will, and lure everyone away. In essence, you really wanna get one of the Ubers alone from the others, and run.

Ubers do not have regeneration. They do, however, have HP.

Do not use multiple Oak Sages. You only need one. Same with Auras: deversify, and let only the strongest be active, unless you have two of comparable strength.

also, for damage per swing, I do beleve that you forgetting a very vital piece of the puzzle: defense. Defense factors in per hit. Also, difficulty scales per player in game; if you have eight summoners, much less one, that will cause a very major occasion of lag, where every second spent alive is crucial, not that you can react.

So really, the most effective party would be:
Zealadin (for Fanatcism) or Avenger (for Conviction)
BO Barbarian
Smiter (you need stun, DESPERATELY)
Druid (Oak Sage)
Trapsin (no, really?)
3 Summoners

Oddly enough, I have three characters on three accounts capable of fulfilling that role. However, should I choose to develop my second Frenzy Barbarian, it would be even MORE effective, but nah. If I ever feel like telling SRL to develop my Frenzy Barbarian on Rothinzil, I'll let him know.