It's difficult to say without being able to see images of the stone. Can you ask a GG to evaluate the diamond to see if the clouds are impacting the stones brilliance?
Agree, have a GG assess the stone (is this one from JA you were interested in?) while still in house and see what they think in terms of eye clean. Define YOUR eye clean - usually it is 12" face up, but if you want eye clean from the sides or at 8" as well, specify that in your request.