This would be EXTREMELY useful. As it stands right now, unless you happen to be looking when a donation is made, there is no way to tell who donated the troops you find in your CC.
I would like to be able to click on CC troops, and see who donated them, both for my own CC, and everyone else in the clan. First, this would allow you to quickly see anyone routinely donating goblins, WBs or other undesirable/non-requested troops just to mess with people. More importantly, it will help in coordinating efforts for Clan Wars. We routinely try to populate war base CCs with particular troops in order to gain a defensive edge. New/lower-level clan mates often are slow to "get the message" on what we do NOT want them donating to the CCs. Being able to track who donated what would be an enormous time-saver in coordinating our defense.