Well, considering what we already have now where we might have something missing/something to upgrade...
The positions below are just a quick interpretation of Fred's offense...
Point Guards - Morris, Custer
Shooters - Long, Thomas
Wings - Hogue, BDJ, Nader
Stretch Posts - Niang, The Greek
True Post - McKay
So could you find better past players for any of these roles...
Point guards - Tinsley, Kane
Shooters - Hornacek, Hoiberg, Thompson, Babb (not a bad shooter and an incredible defender)
Wings - Grayer, Stevens
Stretch Post - Ejim, White, Brackins
True Post - Fizer, Cato
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No offense to Monte Morris, but Tinsley would be a massive upgrade there.
Likewise to Naz/Thomas to get Hornacek, Hoiberg, Christopherson, or McGee.
Wings, I'm not so sure there is a clear-cut upgrade given the style of the modern game and how much those three have already proven/how well they fit Fred's newfangled style.
Bringing Ejim back would be awesome, but probably not as much as Royce White for just being a completely unique (and, at times, dominant) sort of player.
Fizer would be awesome teamed with Niang and do well in the go-go-score game that Fred has us run. Cato was incredibly, yes, but I imagine McKay covers some of that ability.
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I can't really decide. I would think our weakness is going to be defense (like it always seems to be), which argues for a Babb to play their best defender and/or Cato to protect the rim, but I feel McKay might have that covered. Upgrading to Tinsley at point guard makes sense, too, given it all flows through that combo guard position in the modern college game. Our current crop of shooters is really good, but not "great," which would mean it would be really nice to have the player Fred around, too. I could so see Fizer, probably the best player in school history, tearing it up in this system and feeding off Niang and the shooters all day long, too. Royce is just Royce for, again, being this unique sort of point power forward/point center for us.