and finally
Havok beats Vulcan, but again, Havok has been powered by a Sun, only more literal this time
so like, I guess there are two ways to look at this. 1) Havok is literally capable of being lifted to a Mid/High Herald class powerlevel if he is exposed to enough energy, and therefore Vulcan is above the tourney limit, or 2) The Warlock fight is more of a Spider-Man-vs-Firelord moment, and while a high end feat, beating up on Black Bolt, who is holding back his most powerful attack, probably doesn't outright disqualify Vulcan.
The problem as I see it, if we go with 2, every fight with Vulcan will cease to be about strategy or debate, but just about how good of an energy manipulater Vulcan actually is. Its not really even that there aren't enough appearances at this point, but more that he only has experience with the X-Men, and not a lot of more cosmic characters to judge against. Its a good choice, but for what its worth, there are lots of other low-heralds that can give you essentially what Vulcan does. EDIT: also, whoever selected Vulcan probably wants more than a "havok-level" energy manipulator on their team, when every first round choice was an energy manipulator...