Whether it was small or big, there is no such thing as "not a real concussion state." You are either concussed or not, there is no middle. Gardiner probably got concussed, we'll see if he plays today. But yeah he probably got concussed last night.
I don't think that its a big deal that Gardiner isn't playing today.
I think its important to give him days off throughout the season, especially on back to backs.
I just wanted to post that but as I said previously agreed. A week off if necessary for something as serious as a head injury is no problem to me. Those are risky injuries career and personal level wise. It could be easily a pre-cautionary thing as well.