Can you recognize the boxer on this picture?

Hi guys I have a coworker who claims to be Benny Benitez (http://www.boxrec.com/list_bouts.php?human_id=40739&cat=boxer) an up and coming lightweight contender in the late 70's. So far all I could find about him was his boxrec profesional record and a this picture,

This content is protected

although the boxer doesn't resembles our coworker (51 years Today) and other coworker that knows the boxer since childhood claims that's not him on the picture. So I came to the best in the business (EastSide Boxing Classic) to see if you can recognize someone in this picture, there's a small handwriting in the lower right corner that says something like "Smooth
Gary Sho- I believe is Gary Shaw...:roll:
M S G" - as in Madison Square Garden"

For the record we are not trying to blow up some hoax or anything , actually we are trying to gather some photos, or footage to make achievement/ support activity for this guy, since he recently was diagnosed with a terminal illness and cannot work anymore. Any help clearing this out or gathering more info would be deeply appreciated.

 

Two clues : the big guy on the left is too old to be Gary Shaw, unless Gary's father has the same name, cause it does resembles to Gary a bit. The Boxer I Believe is Carlos Monzon:

This content is protected

What do you think?

 

Ok, I'll be pretty convinced is Monzon, but what about this guy Benny Benitez, he fought Ken Buchanan in 1979 any memories?