I think Johnson has a chance to grow into the ideal Leo our coaches want. If he continues to bulk up and doesn't lose any speed or agility, he could potentially have the size/strength/speed combination to both play with his hand in the dirt and drop back into coverage.
I like Maggit as a Leo, but I think he's more of a pass rusher than an edge setter with his hand in the dirt. Jakob's natural size and athleticism mean he could potentially be a Leo who can do both of those things as well as drop back into coverage.
Of course, he may end up transitioning to DE or MLB full time and that would be fine too. The coaches will play around with him over the next year or two and see how he fits. But IMO, the ideal outcome would be that he blossoms into an versatile Leo who can do a lot of things.
We have a lot of LBs on board for the 2014 class and more coming in 2015. Plus, over half of our snaps are now in the nickel. A versatile Leo who can set the edge, pass rush, and drop back into coverage could potentially make a bigger impact on our defense than another MLB: it would allow for a lot of exotic blitzes and could result in some easy turnovers for our D.