The Greek Gods were said to be envious of mortals, because their single life meant that everything they did was more important, more impactful, more decisive, more meaningful than anything a God would ever do.

If Pheidippides is in some way looking down on all this... or even if he isn't...

He has achieved immortality, in the form of essentially a secular religious tradition stemming from him, that unifies the entire species in the peaceful furtherance and celebration of physical and mental discipline and perserverance.

I cannot easily think of much more noble a legacy to leave behind... he has transcended the specific cricumstances of his life and times, and become the father of a beloved tradition, dedicated to to the indomitability of the human body and spirit.

His particular name might not be as famous as say, Achilles... but ...

I feel he wouldn't mind.

It was, after all, about the delivery of the message, not the messenger himself.