Oh Christmas has come early. With all the rumours flying I've cobbled together an army of existing models on the eve of a new codex.
Lord of War:
Death Company Dread
Death Company × 10: power fist, power swords x 2
3 x 5 tac squads - rhino melta guns
10 Assault marines - 2 melta guns
Baal pred - bolter sponsons
Lots of better combos and options from what I can tell but its an army I have built. If I proxy vanguard vets and a furioso for the death comoany models I think I can run the army properly as Flesh Tearers. Though not sure if I can add in an HQ and lord of war to the detachment.
Seth would likely do better with a squad of vanguard vets in a storm raven. Cheap storm shields would give them a chance if the raven blows up while zooming. Melta bombs to take on knights. Squad is fearless with Seth. Seth gets rampage, rage, +1 attack for any roll of 6 to hit plus a buff from librarian for d3 extra attacks. Even with out special detachment rules vanguard vets may be the best fit for Seth. With an HQ slot open can take a priest for another great force multiplier.
Good times ahead. Looking forward to playing a proper 7th edition army.