This move isn't a surprise. As I wrote back in April, Smith is a project-type player who will need time to translate his abilities to a football field. Standing at 6-foot-7 and 240 pounds and possessing 4.75 speed in the 40-yard dash, Smith has the tools to find a role in a league taken over by large, hyper-athletic tight ends.
That he was assigned to the practice squad tells us the Jets were shown enough to believe Smith eventually can make the leap. But that time is not now.