Last year, the Tampa Bay Buccaneers were pretty even in their distribution of targets. At least if we look at players in the slot vs players out wide. Football Outsiders did just that and found that Winston targeted slot players about 1.5 times as often as wideouts, which was slightly above average.
That’s not that much given the fact that two of his best three targets (Cameron Brate and Adam Humphries) played almost exclusively in the slot, and he had no reliable wide target other than Mike Evans—and even Evans spent some time in the slot.