TwoHand,
Actually you are incorrect in your statement. For better or worse Nationals isn't about a 5 man team anymore, it is truly about a 10 man team. You need 10 guys, all willing to work together for the greater good, playing similar lines breaking down the lanes correctly in order to achieve high scores. All the teams that have won the last 5 years, have done this. Riggs has 10 guys going committed to the plan. Nicholas J Pro Shop has 2 teams. The teams at the top this year are part of two team groups.
In regarding styles, while it helps to have people with all similar styles, it isn't always available. What I think you need is the majority of people with similar styles. Have one high rev player playing inside of everyone won't wreck the pattern too bad, especially this year with the new Ice oil. But having 2 or 3 of them will. Having one speed dominant person throwing a high grit surface won't wreck the pattern but having multiple one's will. Actually if you balance it out right having one of each can actually help. The speed dominant player can play a few boards right of everyone, drying up that line. The rev dominant player can be inside of everyone, usually throwing something more polished pushing the oil down....that creates a big window for the others right in the middle, miss right hit the dry created by the high grit ball, miss left hit the oil pushed down by the polished ball.