What about FA WR Terrace Marshall?

I would love to have him try to grow as a Saint. We have room in the WR room for a development guy.
When it comes down to it, most teams don't have room for 'development guys'. Rosters are tight and those on it have to be functional contributors.

That's why fans bemoan 'high potential' players being released come cut down day, while the truth is that most of them never catch on for good reason.