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I think Jackson was ahead of his time.  Glad people recognized this despite unremarkable total catch #s.  He averaged 24ypc I believe his final season, was very fast.

as you say, "college Only"

not Moss

Keith Jackson: 4 years (84-87):  65 catches,  1,561 yards , (24.0 ypc), 15 TDs.  21 rushes, 298 yards, 4 TDs.
Those #s look like a great single season when viewed with today's lens.
2 time Consensus AA.  I still think he's the best TE I've seen in College.

Now, I can think of two games during that career where OU didn't throw a single pass.  OU didn't attempt 100 passes as a team in either 1986 or 1987.  They probably didn't throw more than about 5 passes a game, in many games.  Like some of the GaTech WRs (Calvin, etc.) he got into physical mismatches and got single coverage in hitch and go, fly, and post routes.

IIRC,  Jackson's Mom is what persuaded him to go to OU.  She loved Switzer.

Richter is a member of the College Football Hall of Fame, the Academic All-America Hall of Fame, the Rose Bowl Hall of Fame and the Wisconsin Athletic Hall of Fame. 

He was named to Sports Illustrated's NCAA Football All-Century Team.

Richter is a member of The Pigskin Club of Washington, D.C. National Intercollegiate All-American Football Players Honor Roll.

The University of Wisconsin–Madison twice honored Richter during the 2006 football season. On November 4, his number 88 was retired in a ceremony during that day's football game. On November 17 a bronze statue of Richter was unveiled in the Kellner Hall plaza immediately outside Camp Randall Stadium.

Richter was a nine-time letterman at the University of Wisconsin-Madison (the last person to earn such a distinction in school history). He lettered three times each in football, basketball, and baseball. He was also an All-American end twice. Richter set a Rose Bowl record with 11 catches for 163 yards in the 1963 game vs. No. 1-rated USC Trojans.

but, what about the NFL?

and Randy Moss didn't get the opportunity to play in the Rose Bowl

Just #88, has 3 SI All Century members on 1st team.
Pat Richter
Keith Jackson
Jerry Rice.

On the FWAA 75 Year Team (released in 2015) 
1st Team: Jerry Rice, Keith Jackson
2nd Team: Randy Moss

Jackson is helped in this vote by the other 2 "biggies" having a low level of competition.  Moss would've played at ND or FSU if he had his head on straight as a youth.  As it was, he was an all-time talent playing against the likes of Army and East Carolina.  He also had above-level QBs throwing to him (FLA transfer Kresser, then Chad Pennington).

Yeah, that's the issue with Moss.  Not only was he playing in the MAC (actually 1AA for his first 1 or 2 years), but it's not like he had MAC level QBs.  It was a big time QB-WR combo playing against MAC schools.  Same with Rice, whose QB I believe also had a cup of coffee in the NFL.
I kind of have to defer to other and what they say about Jackson, because the numbers are the numbers, and he was slightly before my time.  IMO people are sleeping on Marshall here too, but I've heard, long before this vote, people who believed Jackson was the greatest TE of all time.  So that means something to me.  The funny thing it you probably have the two guys who would lead an NFL vote for greatest WR of all time, and it's not like their college careers were anything to slouch at, but they did it at such a low level.