Certain parts of the DeLeon family went to Louisiana and others went south to Camargo, Tamaulipas. The Benavides family who married into the DeLeons went to Louisiana and later came back to Texas. Parts of the Benavides family were the founders of Benavides, TX.
My GGGG grandfather Julian de la Garza was married to a Leonor Benavides and were founders in Victoria along with Martin DeLeon. A daughter of Julian was married to Agapito DeLeon (son of Martin) and after Agapito was killed by white outlaws she moved to Camargo. Julian's last son, Alejo de la Garza was brought as a baby to Camargo in 1836 by his uncle and later ended up in San Diego-Concepcion, TX area as a grown man. This is discussed in my web page www.brokersys.com/~joguerra/alejo1.html
on Alejo de la Garza.
I know that members of the DeLeon family did go back to Victoria and found that their holdings had been taken over by the local white settlers, usually Irish backgrounds. The laws had changed and of course the DeLeons had lost their influence. There must be some DeLeon web pages that could better describe where they ended up. Sorry that I can't help you more although I know there have been reunions in Victoria celebrating the family. The site I have from my web pages tells of a local Hispanic Genealogical Society in Victoria and maybe they would know better.