Question on Killgrave...
The thing that bothered me is they said Killgraves power was the result of a virus taking hold of those it came in contact with. It's one of the reasons he had a range and why after 12 hours it wore off.
So why would making him stronger have given him the ability to do it through the phones or TV's?
His power 'doesn't work' over the phone just because you need to be infected first. If you are already, he can still control you. ( See hospital at start ). Making him stronger just made the infection last longer and spread better so phone or tv was more practical