In the original E3 2014 Dead Island 2 reveal trailed (linked below), there were two very familiar voices that could be heard towards the end. These voices sounded crazily similar to Jack Black and Aaron Paul, and led many people, including myself, to believe that both Jack Black and Aaron Paul voice acted two of the characters within the game. But is that really the case?
Dead Island 2 E3 2014 Reveal Trailer
https://www.youtube.com/watch?v=Q5cdtMP3xT8
Jack Black Reddit AMA
https://www.reddit.com/r/IAmA/comments/282bqf/hey_reddit_its_me_jack_black_lets_do_this_ama/ci6rbxm
Dead Island 2 Game Director Bernd Diemer's Answer
https://youtu.be/vQh6ztkK9xo?t=4m28s