With our veteran leaders in Cotchery and Avant we could take Blackmon in and possibly turn his life around. Once he gets his life together and gets his head on straight he's easily a #1 WR and compliments Kelvin Benjamin very well. They're likely to release him anyway so why not offer them something before we lose out on him?
With Alexander being in Rivera's dog house to start the season, getting busted can't help that out too much. Plus with the addition of Ealy it makes Alexander expendable.