Right off the rip the answer should be Jason Pierre-Paul BUT lets peel the onion here a bit. Gerald McCoy has averaged 7 sacks a year (6 last year) but he will have the most help he has had in a while.
Vinny Curry had 3 sacks last year but came off a heavy rotation for the Super Bowl champs and had 9 sacks in 2014 when he saw more time. Could he be revitalized alongside these studs? Once the sacks start counting there is a competition among these guys that is a real thing.
What about Will Gholston? A healthy Will Gholston coming in to spell JPP?
OR will the sack king come from somewhere else on the depth chart? Perhaps Vita Vea will show how versatile his game is from the inside of the Bucs line? Beau Allen?
Stepping away and taking a glance the easy answer is still JPP BUT its pretty refreshing to be able to debate this. Last year the question would have been "Is anyone going to get to the QB?".
From a fantasy perspective the Bucs D is a sleeper to keep your eyes on. Sacks from the line, tackles from the backers. This D-line barring injury should gain speed and impact as the season gets going.