Few grammar questions on usage of "the","as soon as","only just"and"no sooner".

As soon as i had made a separate thread for 'usage of the' it was closed :oops:
Sorry, therefore I am writing this again here :

which one is correct :
'the best and the most' or 'the best and most' ?

Do i need to repeat 'the' even after 'and' or a single 'the' would work ?
Example:
He is the best and the most intelligent person. or
He is the best and most intelligent person.

Later(After Brainstorming:drinking:) :

These are my conclusions for usage of 'the' :

the best(as noun) and the worst(as noun) >because here are two nouns.

but The best(adjective) and most intelligent(adjective) man(noun) >single 'the' for two adjectives describing a single noun.

Please correct me if my conclusions are wrong.