They can only take one in the expansion "draft". But they could do a deal immediately after... they "pick" Carrier, then BUF trades them Moulson and a 2nd for Vegas' 3rd or something of lesser value.
Based purely on ability, I wouldn't exactly hate the idea of keeping Bogo around. He'd provide good depth, albeit expensive depth.
The issue with Bogo is that judging by his body language and the way he talks in interviews... he seems like one of those guys just happy to be in the league that Eichel was referring to. When talking about creating a winning culture off the ice, I think he's a guy that needs to go. Whether or not JBOT sees it that way, time will tell.