Dark Hole is a much better assist than people give it credit for (for the lockdown/protection and some combo extension stuff), but I wouldn't solely rely on it. It's screen coverage is severely limited and will do essentially nothing against many characters who can simply choose to play in the air and never land on it. It also won't do a damn thing in any serious projectile war.
This is somewhat less of a problem if you have Vergil sitting on a ton of meter so that he can BS his way into pressure, but I recall you stating that you play him on point, so this isn't the case.
I don't know who your third is, but if you are going to have both characters on the same team I would put Disruptor/Missiles/Insert beam assist here/maybe even drones behind them so that both characters get an ideal/near ideal screen control assist in addition to the more utility-like assist that each character can provide for each other. I personally go with Disruptor. (I've actually played that team to shut everyone up when they thought they could play Dormammu after seeing EVO, though I have Vergil, or Dante for that matter, second instead of first).
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Playing with only Dark Hole sort of reminds me of my half-baked Magneto team, Mag/Vergil/Ammy. Of course, Magneto doesn't need a full screen assist to get around, and in the event I kill someone with the Mag/Vergil dhc (which, by the way, is ridiculous) I now get to play Vergil with Disruptor in addition to Cold Star lockdown. Even with Cold Star by itself, it's one of the few assists that can function in place of an OTG assist while retaining it's acceptable control of the horizontal playing field. By that point I should have plenty of meter anyway, and once that crap starts with Cold Star it pretty much never ends.
Edit: wow, three posts since I started writing this post, guess everyone ran back here after the stream ended.
