Smith fell to the sixth round because of health concerns (he dealt with blood clots during his time at Tennessee). If you take those health issues out of the equation (Smith played in every game at UT the past two seasons), then there's no doubt that Smith was one of the best overall players in the 2021 NFL Draft.
Why has Trey Smith not been drafted?
It was widely believed that Smith's medical history — the blood clots in his lungs — threatened his football future in 2018, likely kept multiple teams from drafting him. Smith, a long-time fan favorite, told reporters that he's “definitely going to be motivated” by his draft slide.
Why did Trey Smith slide in the draft?
Smith showed this after being interviewed at the team's facility. Smith had to step away from football after his freshman year at Tennessee after blood clots were found in his lungs.