I noticed when starting Yr 2 of my franchise that released head coaches that are available for hire, like Norv Turner in my case, have their photos instead of the grey mist.
Given the grey heads are all there, I have a feeling the feature is actually there, but EA may not have permission to use the photos of those not currently working with the NFL.
And when Carson Palmer goes into coaching, the reason he might not have his photo shown is that EA are allowed to use his image as a player, but not for any other means.
Lawyers...