Who should we add when Driskel goes on IR or cut/add?

[*ochocincos*]

I honestly don't understand why the Bengals would care to have Driskel as an option to bring back from IR unless they hope to move McCarron before the end of the season.
Or perhaps they want Driskel to have an opportunity to continue his growth before the end of the year? Is he not allowed to even practice if he's technically on IR?

A team rarely ever uses its 3rd QB, so this one was always a head scratcher.