The unfortunate side effect of training camp is its temporary nature.
The Detroit Lions have brought in over 90 guys who held contracts to play at least the 2015 season, but the grisly reality is at least 27 of them—almost a third—will be out of a job come the second week of September.
And that's if the Lions use all of their practice squad slots on players currently on the roster, which is no guarantee.
Nobody likes delivering the summons with a "bring your playbook" thrown in. The Lions have a lot of tough decisions and awkward conversations in their future.