I am not sure if you had the chance to look at the documents but as an aside the Dirk van Eldik married to Nellie van der Velde is not the same person. He immigrated around 1889 and the Dirk from Overissel, Michigan came to the USA in 1914. Both men were single early 20's and married in the USA. They don't seem to be closely related and no apparent connection point, they came from different areas in Holland.
Dirk from Rock Valley who immigrated in 1889 came from IJzendoorn and I attached his family record.