Losing Palmer (which was a given as his draft stock was high for obvious reasons) is the biggest loss. Probably the best receiver NU has ever had.
It also sucked to lose Thompson. He would not have been as effective without Palmer to throw to, but still, would be nice to have him. And yes, I know he is now injured, so it makes the whole thing moot. Still, he was an actual QB who could go through progressions and play the position and get the ball to receivers. Right now, we have the FBS leader in turnovers, and HH, who is a major project, and likely never will be a true QB (not that I am hoping he doesn't become one or am shitting on his play last saturday - he played well). We are just devoid of QB talent on the roster.