Ask HN: do we need a pusher/seller/rainmaker?

With my partner we plan to create a startup in the cloud security domain. While we technically complement each other perfectly and already worked together very well, I am afraid we are both a little too friendly, humble, judicious.

So my question: do we need to complete our team with someone energetic and emotional, who adores talking to people, convince customers at conferences or tradeshows, and even doesn't mind to aggressively and persistently try to sell our idea - the pusher/seller/rainmaker guy, the kind of charismatic arsehole ;-)? Or will we grow automatically in such kind of role? Any opinions, storys, examples?