Isn't Satoshi richer than all of them? Why isn't he on the list?
He's unknown, no face to put to the name.
Plus, I'm not sure they would be able to correctly gauge his network. Besides bitcoin, he may have other ventures.
For example, I don't know the net worth of Hal Finney *or other early members*, but it may be high considering he was an early adopter of BTC.
They can use a silhouette as a picture (I've seen it done with other posts). As for his net worth all they need to do is give an approximate number. We know how much BTC he has so we know the minimum of his worth.