The backup quarterback problem has been an issue that has plagued the Detroit Lions for years. The last quarterback that you can even argue was helpful was Dan Orlovsky all the way back in 2015.
Even then, Orlovsky was really only helpful to the Lions in the meeting room where he could assist starting quarterback Matthew Stafford in film study (Orlovsky is well-known for being a very bright football mind, similar to Josh McCown). Other backups that have been at least somewhat useful in Stafford’s career include Drew Stanton, Shaun Hill, and Kellen Moore (more for his mind like Orlovksy).