From the video

Unlike Cook, Emmett Johnson, back to him, executes cuts with his game. And like Cook, he leans hard on curvilinear movement... Johnson also flips his hips efficiently... Johnson identifies pre-snap tells from defenders... Johnson has precise feet to press deep enough into the line... he's skilled and experienced with duo and varieties of zone
STACKED’s take
Elite movement versatility: lateral cuts, curvilinear movement, and pre-snap processing.
Only running back to perform the three-cone drill this year and demonstrates elite movement versatility: executes lateral cuts like most backs but also leans hard on curvilinear movement like Dalvin Cook, flips his hips efficiently to make 90-degree turns without cutting, and processes information fast like Devin Singletary to identify pre-snap defensive tells for quick cutbacks or bounces. Post-snap, has precise feet to press deep into the line past defensive penetration and assess defenders. Runs gap plays frequently (limiting cutback/bounce needs) and is skilled in both gap and zone schemes, hitting the crease hard with pace and stride manipulation; footwork allows him to alter stride and pacing with his steps to get his feet over contact.
Emmett JohnsonKCPlayer page — value, ADP, projections, and every insight