coops there is no such thing as a stupid question just stupid answers or people 
as for your dog then he has no early just a fast trapper there is a differance 
i have a fast trapping early paced dog and i have an early paced dog here very differant some just learn to trap well 
in answer to your question it dosent mean if a dog has no early he can stay 
but might if i were you i would trial him over the next distance up and again up so on to see where his best distance is 
to show you what i mean look at this video and watch trap 5 the early paced sire 
and trap three is the stayer better over longer trips 
also watch trap one the third type of runner the back straight specilist 
Greyhound-Data Video 310,000 2008 paddypower.com Irish Derby Final
hope it works for you