Harold Landry will be drafted high by an NFL team. Unfortunately it won't be in Round 1. That's disappointing for him (and his family and friends) but there is still plenty of opportunity ahead. Landry loses a bit of money going later, but I imagine teams will start jockeying and trading to get him in the second round.
How did this happen to a guy who at one point was listed as the best DE in the Draft? Obviously not playing most of 2017 raised a lot of red flags. As good as he was in 2016, teams don't know exactly what they are getting. With the first round, teams want sure things.
There was also some bad luck, where the teams that were supposedly interested went in another direction. The Lions went OLine, the Patriots went OL and RB, the Falcons grabbed a WR, the Dolphins went DB, and the 49ers went OL. None of the teams that "liked him" picked another DT or DE over him.
Mel Kiper has Landry as one of his best available still on the board. I don't think the wait will be long in the Second Round. I hope Landry has some patience and uses the snub as motivation.