On the Find Dylan fb page under the "Recent posts by others", someone posted a message to the Admin about contacting Texas EquuSearch -- (she included the email she sent to TES), Denise responded they had already approached LE about this and LE said they're asking people to hold off (I'm paraphrasing).
Now we know that's been formally presented through the proper channels. Hopefully if this weekend doesn't bring answers, LE will be open to bringing in outside help.
They need to bring outside help. This is a very long road they are planning to search tomorrow. Appears to be surrounded by a huge wooded area, so just searching ditches likely isn't enough.