The core argument comes down to a thing that Bitterman said that Song would be 'really fitting' to have Combat Precognition, which locks Daggermaw and Mr. Hunch in, and then most people want Soldier X in as well to help rejuvenate his body so his age is less of a concern for our opsec.
Then, most people seem to want something that gives him Invulnerability and also an Elemental or Energy Manipulation to also give him Telekinesis of some sort.
My camp is that Frostbite not only provides that, but is also more efficient in that it also adds an extra Enhanced Strength, which could boost Combat Precog and/or Telekinesis, owing to a theory that a 3 or 4-tag combo would be enhanced or upgraded if a tag is repeated twice.