Purdue is in an entirely different situation than Iowa. They have a potential Final Four team with a definite NCAA birth coming, and if adding Jackson gives them a better opportunity to get there, then it is a no-brainer to play him.
Iowa is clearly in a transition year that will result in a sub- .500 record. He could most likely help this year, but help what? Win a couple games and go from 6 games under .500 to 4 games under .500? It is clearly in the best interest of Archie and the TEAM for him to redshirt.
Iowa has basically no postseason hopes this year. Next year should clearly be an NIT year, with an outside shot at the NCAA if guys continue to improve and the incoming class is ready. Two years from now this team should be ready to make the jump to the NCAA. Archie could be a part of a potential NCAA team in two years, or part of a 10th place team this year.
No-brainer to redshirt.