J's Number: 600 Walking Troops

Regarding J's number of 600,000 people, it may be read as 600 "Elef Ragli", 600 walking troops. This interpretation is explored in an article for P's later census numbers also. It seems to me that the explanation, in the article, of the numbers of the Levi'im and the first-born, must be applied elsewhere in the same way. The implication is that a "walking troop" would be about 30 people. So the people, the 600 Elef Ragli, were about 18,000, before a large multitude died. It would be 36,000 if one assumes that only men are counted.