This scouting staff would speed walked to the podium to make the first overall pick in 2015 when they realized that Dylan Strome is still on the board at 1!
edit: the joke is that strome is a big guy, so they'd take him over McDavid, who was a generational star but only of average stature. Additionally. there are some absurdist elements to the joke, with the scouting staff realizing Strome is still on the board at 1, when in reality, every single prospect is still on the board at 1 because no one has been taken. So the idea that they would be excited at Strome being there adds an absurdist element to the humour.