Having a well thought through business plan is the main thing, the filler words are a secondary issue. Obviously someone with a solid business plan who speaks

Having a well thought through business plan is the main thing, the filler words are a secondary issue. Obviously someone with a solid business plan who speaks cautiously is in a much better position than a smooth talker who is selling vaporware. That's the value of the YC group, they have their priorities determined and they don't get taken for a ride.