Every year I bring up the need for a camp placekicker and punter to come to camp.
The competition and the insurance is well worth it IMO.
I always get shouted down, but this is the exact reason to have one of each.
Days have gone by without any real special team plays because of this. The same would happen it the punter pulled a muscle.
Also, by bringing in camp legs it solidifies some relationships IN CASE your starters get injured during the season.
Guys like Cain and Harris are long shots to even make the PS. They don't need to be in camp but an extra placekicker and punter do.