Ray...Yes. Genesis is an especially obvious collection of stories from north and south that were collected and somewhat woven into a single text. This produced much inconsistency and duplication. The compiler was more interested in preserving disparate traditions than perfect harmonization. Surely you have seen this in the 2 creation stories, the two flood stories, the 2 genealogies, etc. The basic J (itself with layers J1 and J2) narrative seems to have been the most complete and formed the basic outline. The standalone Flood stories (J and P) placed into that narrative where they are, creates a number of storyline issues. Why are there Nephilim in Cannan when they should have drowned in the flood? Why are there people living hundreds of years after God decreed a limit of 120 years? (J has no one living older but P does) for examples.
Nimrod is one of the Nephilim, 'mighty ones' but that is lost on readers because of the Flood stories interruption.
The standalone J Tower story never mentions Nimrod and was inserted into the narrative at the mention of the city's name. A convenient spot but it doesn't fit the narrative again. Notice in chapt 10 before the tower story there is already a table of nations and empires (itself an insertion) Notice too that 10:31 is continued at 11:10, interrupted by the tower story.
29 and Ophir, and Havilah, and Jobab; all these [are] sons of Joktan;
30 and their dwelling is from Mesha, [in] thy coming towards Sephar, a mount of the east.
31 These [are] sons of Shem, by their families, by their tongues, in their lands, by their nations.
---------------INSERT TOWER STORY HERE---------------------------
10 These [are] births of Shem: Shem [is] a son of an hundred years, and begetteth Arphaxad (GLOSS two years after the deluge).
11 And Shem liveth after his begetting Arphaxad five hundred years, and begetteth sons and daughters.
12 And Arphaxad hath lived five and thirty years, and begetteth Salah.
13 And Arphaxad liveth after his begetting Salah four hundred and three years, and begetteth sons and daughters......................