Beau Blankenship's hope of making the final roster will depend on how he capitalizes on any mistakes from Robinson and seventh-round pick Storm Johnson.
Those two running backs will likely be tasked with the kind of work that Blankenship will vie for. That work will include the return game, as well as catching passes and providing a change of pace out of the backfield.
Blankenship's chances can be boosted by ball-security issues that have plagued both of his competitors. Robinson had major problems holding onto the ball as a rookie in 2013, per The Associated Press via Fox News:
The former Michigan star struggled with ball security, putting it on the ground way more often than the Jaguars wanted in practice and games. Amid those concerns, Robinson spent much of his first season on the sideline. He finished with 20 carries for 66 yards, misfired on his only pass attempt and fumbled three times.
The Jaguars responded by narrowing Robinson's role to running back. Robinson responded by working on his pass-catching and ball-handling skills relentlessly during the offseason.
Meanwhile, Johnson's problems were quickly cited by Bradley following the draft, according to ESPN.com writer Michael DiRocco: "Moments after drafting him, coach Gus Bradley said Johnson really struggles in pass protection and he also has trouble holding onto the football."
Blankenship will have to work hard to prove himself to be a more reliable alternative. However, he faces a tough task.
Johnson is familiar with Bortles, having lined up alongside him in college. As for Robinson, he possesses a level of versatility and dynamic athleticism that Blankenship simply can't match.
Expect one of Robinson or Johnson to win the third-down running back job, while the other works as a returner. However, lingering concerns over the pair's penchant for mistakes will serve to keep Blankenship on the practice squad as insurance.
These five players may begin next season on the practice squad, but they have the potential to quickly change their fortunes. In particular, both Morris and Jordan can show coaches they belong in Jacksonville's offense in the future.