Your post is full of fail.
First of all, Cam weighs about 230/240 right now at a 6'3'' frame. He couldn't keep with tight ends like Eifert when he was a goddamn safety at 205, so now when he has 25 extra pounds on, why would you want him playing receiver?
Next, Cam actually is the best linebacker we had at the SAM spot before the season started. The reason why he sat out most of the season was because of a back injury, not because he was low on the depth chart. I still think he's going to switch over to MIKE (behind Demens) or WILL (supplant Morgan) because Ryan and then the combo of Ryan/Clark has too much playmaking potential to take off the field.
Finally, Junior ran a 4.5 40 yard... I don't think that's particularly slow. Is he Devin Hester or Denard Robinson? No. But is he about as fast as Tree or a lot of other NFL possession receivers? Yes. And that's his role. A big possession receiver.