Napoli have confirmed they're bringing Insigne back for preseason. Yeah, he could still move after that, but ADL seems to be banking on his inclusion, has said that they're set with 4 forwards.
I don't think they'll want to replace a 6' 2" striker by adding a second 5' 4" water bug.
Would love Cavani, and would obviously include Giovinco in any deal to acquire him. Just doesn't seem realistic at all, though.