I'm not a size above everything person either but it does take a special player to defend guys much larger than yourself at the NHL level
Not having the physical stature so you can use your body to angle guys or physically seperate them from the puck makes life much harder for your smaller defender, especially in net front situations
We lack places to develop some of these guys, one AHl team with 6 defensive spots available is a real problem
Kral, Rubin's, Duszak, Hellickson, Hollowell are all guys you could argue deserve development time and there's other guys I'm forgetting and at least 3-4 older guys who are leafs spares in case of injury who need to play to