Water Heater Question

Hello!
I am working on a Atwood water heater # GC6AA-7P. This unit was missing the pilot light assembly so I had to buy a new one and install it. I bought a Pilot Assembly 9 Jade (Atwood) 91603. I light the pilot manually with a long grill lighter. The thermocouple does open the main gas tube valve. But it seems the pilot light tube is not in the right spot to light the main tube. The pilot light tube sits a little behind the end of the main gas tube. Should it be sitting more past the end of the main tube so the pilot flame will light the gas coming out of the main tube??? I'm not saying in front of the main tube. I'm saying on the side of the main tube but past the end of it. I was getting a little nervous listening to the gas come out of the main tube and the pilot flame not ignite it. Does the chamber the main tube dumps into have to fill up with gas before the pilot flame lights it? Any thoughts? Is the assembly I bought too short to light the main burner? Because it did not have an old one I have nothing to compare it to.

Thanks, Rob