As you say you dont know what their involvement is? Im not sure why you are making this a big deal? Weve got bigger problems than injured players taking sick leave! From what I hear from parents of youth players at the club the senior players do help out injured or not. It is also not their fault they are injured!
As for Foran maybe John Hughes didnt want him in dugout? We dont know so you are providing a lack of evidence as to what role players take within the club , when not visible to us?
On the matchday point I agree but I doubt they were ever asked re the potential activities mentioned bar maybe hospitality.