Vehemently disagree with both you and
@DMoney . You are both hoping a 4th guy emerges at DT. Maybe Horton, Jones or even Simpson becomes a key contributor. Maybe none of the three starters gets nicked up over a 13-16 game season. Never bet the team's success on that though.
And haven't we run the hybrid experiment enough to know we shouldn't rely on DEs at DT. Play them there situationally, sure. But they should not be considered when thinking about DT depth. Same as Lofton at TE/RB. Count him as one or the other, not as both.