SOS help! Car radio

So I want to switch out my Kenwood stereo with a JCPOWER audio system. I removed the old wires and was careful to not cut any of the car wires. I noticed that there was wires cut off ND I bought Scosche FD213SD stereo connector. While I was wiring the wires of the new stereo to the Scosche stereo connector my friend said I was doing it wrong and I had to match one out of the 3 that fit the car . So I am very confused I thought I was suppose to use all 3 connectors. And I wanted to see if I can just wire the new stereo connector to the car wires without the Scosche FD213SD connector?
Thank you.
 

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