this would shift the meta-game much harder to aggro control, and away from control.
But the shift would be on the strength in numbers of Oath alone. I don't see justification for this. For me, Oath is more combo-control than anything else. Unless we unanimously decide on a category for Oath, it is up to everyone where he wants to place it. Start separating by different lists of basically the same deck, and you lose the best use of a metagame breakdown, namely to provide an overview about how the tournament shaped up. Broad groups are better than detailed splits with 3-5 decks making a whole "group". I like the separation into Aggro, Combo, Aggro-Control, Combo-Control and Control, and would ditch Prison (those decks are Control) and Aggro-Combo (Affinity/ Ravager is an aggro-deck). It makes sense to separate Control and Combo-Control, which is basically Sensei, Slaver, Gifts and Oath (that last one is highly debatable, though). Those decks are distinctly different from Mono-U, Landstill or the prison decks.
The other way I see doing this is five categories: Gifts, Slaver, Stax, Combo and Others, with spikes like 19 Oath highlighted. That would place the focus on the arguably best archetypes in the format and at the same time show the popularity of other decks. Singletons can be mashed together in any breakdown as long as they don't T8, in which case they should be mentioned by name. The summary JDizzle provided does exactly that. It would also be hot to indicate how many decks from each category made T8.
FYI, that would give a breakdown like this:
20 StaxUba Stax – 6
(1 T8)Stax – 14
(1 T8)16 GiftsGifts – 14
Gifts Oath – 2
(1 T8)9 SlaverSlaver – 9
20 ComboDragon – 6
2-Land Belcher – 5 (all my style, no blue)
(1 T8)Grim Long – 4
(1 T8)TPS – 2
single decks - 3
40 OtherOath – 19
(!) (2 T8)Joblins – 3
U/W Fish – 3
(1 T8)U/B Fish – 2
Landstill – 2
single decks - 11
But as long as JD's breakdowns follow the same rules every time he makes one, I'm fine with any system.
I might add that I think this reflects the typical Vintage playtesting gauntlet best, at least for time being. Stax, Gifts, Slaver plus a combo deck plus Oath and/or Fish is a typical gauntlet which provides viable testing results.
Dozer