Gaffney and Lafayette have value basically as trade assets, since their (admittedly small) salaries for next year count in the calculations when making trades yet their salaries are not guaranteed.
If Charlotte wanted to unload Diaw, we'd probably need their contracts, along with 'Sheed's, to make the numbers work. Charlotte would then waive them (presumably).
The real issue with any of these kids is that there are simply no real roster spots available.
Veteran players who'll be on the opening-night roster:
Rondo
Nate
Ray
Wafer
Pierce
Quis
KG
Davis
JO
Shaq
Perk
That's eleven.
Add in Bradley and Gody, both of whom are virtual locks to make the squad. Thirteen. 'Sheed's still on the books, he won't be on the roster but he'll be traded for SOMEONE, in all likelihood. We still need a 3. Fourteen spots accounted for.
One last roster spot, with Semih in the lead for it (already signed, and they like him a lot). Gaffney and Lafayette will be trying to take that roster spot away from Semih in training camp, or in a longer-shot trying to outplay Gody.
There's really only space for one real "project" player.