Being a big Bo Jackson fan I had to dive into the numbers for myself.
In 1990, the only RB that could have been selected to replace Bo would have been Word with his 1000 yds and 5.0 per attempt. Barry Word wasn't the starter on his team, Okoye was. Neither made the pro bowl that year.
Bo Jackson averaged 5.6yds per attempt in the regular season, with an NFL long 88 yd TD rush. He was injured (career ending) in the playoffs against the Bengals where he had 6 rushes for 77 yds averaging 12.1. Combined playoff/reg season Bo averaged 5.91 yds per attempt. Barry Sanders was the next closest at 5.10 yds per attempt. Barry was #6 in yards. Nobody in the top 5 cracked 5.0, and 4 of the 5 didn't top 4.5 yds per attempt.
Bo Jackson is tied (5.4 yds attempt) for highest yds per attempt by a RB with 500 or more carries NFL history. The only other higher yards per attempt are QB's.
Bo Jackson has 3 TD runs over 88 yds for a touchdown, only one other player has accomplished this, Chris Johnson. Chris Johnson had 2163 rush attempts in his career. Bo Jackson had 515 attempts in his career. In other words, Bo Jackson will give you a TD run over 85 yds every 171 attempts, whereas Chris Johnson will give one every 721 attempts.
Bo Jackson's 1990 pro bowl was deserved. I can't comment if Bo was better than OJ, Jim Brown, Payton or Sayers, but, he was the best RB in the NFL when he played - sans Barry Sanders (GOAT). I doubt one NFL player or coach was losing sleep when Barry Word was on the schedule.
Check out the 1990 NFL Rushing Stats and more on Pro-football-reference.com
www.pro-football-reference.com