1982 roster question

I could use some Ponyfans help re. a debate I'm having with a non-SMU person regarding the following YouTube clip.
http://www.youtube.com/watch?v=jqlid2F2rfs
The question is who is the 3rd player in the SMU backfield. I know Dickerson and James are back there. And I am almost positive the back that McIlhenny faked to is Reggie Dupard. As I recall, Dupard would occassionally line up with Dickerson and James in a 3 back set. I have expanded the picture and am pretty sure that the player's number is #21, which would be Dupard.
The other person does not think that is Dupard. He believes Dupard was Dickerson's backup and they wouldn't be on the field at the same time. He thinks that 3rd back is a fullback named Clayton.
What is the PonyFans verdict?
Thanks
http://www.youtube.com/watch?v=jqlid2F2rfs
The question is who is the 3rd player in the SMU backfield. I know Dickerson and James are back there. And I am almost positive the back that McIlhenny faked to is Reggie Dupard. As I recall, Dupard would occassionally line up with Dickerson and James in a 3 back set. I have expanded the picture and am pretty sure that the player's number is #21, which would be Dupard.
The other person does not think that is Dupard. He believes Dupard was Dickerson's backup and they wouldn't be on the field at the same time. He thinks that 3rd back is a fullback named Clayton.
What is the PonyFans verdict?
Thanks