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Izumi killed like 20 to 50 other vamps before fightin HS. If it wasn't for Izumi's girlfriend getting in the way, HS wouldn't be here. But I believe
Kurono or Katou would be able to defeat him too. Sakata also.
Too bad Host just hasn't have a fair fight on-screen (excluding katana aliens), but attacking en masse has it's disadvantages as well as advantages (getting in each other's way), which is one of Izumi's fight's aspects. Izumi himself said he's with suit equal with a vampire, so it's a matter of skills. And I seriously doubt a vampire able to avoid laserbeams and Kurono's lighter attack has a disadvantage here.
Ah, also. Izumi and Host've had met before current storyline (Host mentioned it after dino mission). They both left alive.