First of all, thanks for all the opinions and comments, guys.... I appreciate it!
I have the card in-hand now... Here are some enlarged scans of the autographs....
I will be submitting the Foxx for authentication via the internet shortly... The results of that evaluation will determine the next step...
My gut feeling is that the Grove autograph (and likely all of them) are legit... Time will tell whether or not some authenticators agree with me...