To be fair to Jost, his defense is one aspect he is good at. His lack of burst and poor acceleration hinders him offensively but doesn't have that much of an impact defensively. He's a guy who always "almost scored". Just a fraction of a second too late, too slow etc. And ironically, because his feet can't keep up he rushes things with his hands and can fumble the puck when in prime scoring chances. He needs to call Ryan Smyth and ask him to give him some pointers.
I think he also bulked up and added muscle mass, which is the worst thing a guy who struggles with his skating should do. He should work on his quick-twitch muscles and explosiveness rather than strength.