Yes, that is most DEFINITELY a Texas Ratsnake, no question whatsoever now. Those pics are MUCH better in portraying it's true coloration and pattern than the earlier photos were..
Also, yes, the yellow coloration is simply it's background coloration, and not really a "stripe" per se.....and is very normal and typical of Texas Rats.
~Doug
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"a snake in the grass is a GOOD thing" 


