My comp for Ward is Jameis Winston. Winston's got all the tools, and puts together stretches where he looks like The Guy. But he just makes random horrible decisions, and you never know when that snake is going to bite you.
Jameis' arrogance is the probably only thing that's kept him from being an All-Pro (I'll never forget his "I'm balling" quote when defending his 30 picks), so if you think Ward can be "Jameis but less cocky", and you believe your staff can coach him to throw some passes away, he's worth a very high draft pick.
Ward is the kind of boom or bust pick who'd be like the 3rd quarterback taken most years, but will probably be 1st off the board in this one.