Yes, Gaia and Ethan will go hunt vampires together tonight. And mr. Johnson certainly wants the gems, so he can send them out to search for them. 
But I just got an idea, before mr. Johnson will attempt to get rid of Harriets team-members, he'll send her on a mission where an unknown is killing humans, to prove that they are dangerous to harmless humans. Someone will go with her, maybe Morrison or Barow. They aren't characters with a background, but they are loyal to the agency and can always be used for things like this. 

Benjamin will go with Ethan first, but they will split up. Ethan will learn all the vampire hunter tricks from one of his brothers, who is a solo hunter. And Benjamin will regroup with his old ghost-hunting buddies first, but after that team up with Mike briefly and then go back to Ethan. 
It will all happen off-screen during the time skip, but Benjamin is going to be quite the busy bee.

Mike's turning into a vampire, that will happen after the time-skip, before he teams up with Ethan and Benjamin, I want to properly RP the attack and everything. The first one he will go to is Stuart after the attack and then regroup with the main cast. 

And on top of any personal troubles they face, mr. Johnson will be looking to kill everyone except for Benjamin and Ethan, who he wants back in his ranks.