Spring games are dog and pony shows for fans. They actually waste a practice that the head coach would probably want to deploy differently. You don't learn much. We only watch because its the last football we'll see until September.
Lil'Jordan Humphries wants to play. He's strong, smart, and can get the football from any starting position on the field. He'll really help the offense. Colin Johnson can be un-coverable 1 on 1 if he wants. He can jump up and catch anything.
Past that, the offense is reliant on an offensive line that we haven't seen yet. Adding Calvin Johnson at LT should cause an upgrade ripple. There are many moving pieces who should provide depth and versatility. However, like a lot of "shoulds" in life, none of this has happened yet. All the "skill" players on offense are wasted until that happens.
The defense has to be contained by the coach. Otherwise, they'll kill someone. Todd Orlando has at least 3 players that can pass rush from anywhere his sick mind decides to send them. If he arrives at a secondary combination, the defense won't drop far.
I'm not glossing over the "offensive line" bit. That's like saying, "This car will really go fast - as long as the engine block isn't cracked...".