apply for EEA3 or go for naturalisation directly

Hi everyone, need some suggestion.
My partner lived in UK arond 7 years now, since 2003.
as his country joined EU May 2004.
I have one question, can he apply naturalisation directly, from may 2004- may 2009, he can get PR automatically, and to May 2010, can apply for naturalisation. if yes, does he only need provide ducuments from May 2004 to May 2010?

I am not sure, does he must apply PR under EU law before nationality? EEA3 is long time to wait, do not want to waste time.

Thanks

EEAwaiting wrote:does he must apply PR under EU law before nationality?

Not necessary.

He can apply bypass all EEA application and apply for the BC needs to prove the 6 years exercising the treaty right, No need to apply for the PR because is automatically after 5 years.