This is true due to the fact that it will give you different points of view. Also if you have a good mixture of different people types then you will often have people who are stronger at certain things making it easier to solve different types of problems
The answer would a , add period
The theme highlighted in the mentioned excerpt would be perseverance.
The excerpt tells of Rainsford's courageous act of braving the sea to go to the direction of the shots despite of the harsh conditions at the sea. This is evidenced by the phrase "he fought the sea".
The term "doggedly" also describes a persistent pursuit which was what Rainsford showed. He showed perseverance in his actions.
