Carl is correcting listings interpreted by me from census records, that appear in my book Slayden Family Appendix B.
I agree that "H T" is probably "Z T" since the formation of the letters is similar and Z T fits in this spot.
That said, Z T for D L is not as clear to me since both could possibly be in the 1860 census. Since I do not have access to the manuscript census right now, and Z T is shown in some records as b Dec 1860, this suggests that Carl's interpretation is correct since Dec 1860 is too late for Z T to be caught in the 1860 census.
In any case, the book shows E M as a conjectured son of D L (Daniel Lavender) Slayton. We are trying to determine is E M may be Marvin E Slayton, who married an Annie Pittman.