No is not as easy as LoL (You still have the deny mechanic, etc...) but HoT don't check how much money or kills you have, it checks how much money and kill your team have (the point of it, is to make it team vs team and not have players in the same team figthing for 1 kill or a mob, etc...)
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He's one of the main characters of Starcraft, so he HAVE to be in
Edit: Now that i check the list I posted, Jim Raynor is already in the roster, but they haven't said what he will be (maybe a siege character)
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Yep, they already have confirmed Kyle Blackthorne