Blake Bortles has spent his offseason tinkering with everything. His mechanics. His weight. His process. Resting his overused his arm. Pretty much anything you can think of that could lead to a different result than being, empirically, the worst quarterback in the NFL.
For Jacksonville? They're in the same spot they were in the last time this happened, where the team was hoping Blaine Gabbert could turn it around after an abysmal rookie season. When you invest so much draft capital in a player, it's hard to admit he's not the future after just one season.