It sounds crazy, but doesn't sound impossible to me. Last year's "8" and "9" would've been presumably freshmen Williams and Segu, with "6" and "7" being Perk/Caruthers off the bench (even though no one would truly put Perk as a true bench guy). "#10" would've been Fagan or Brock, who truly had minimal at best playing time.
This year, you've got Johnson, Graves, Jordan, Nickelberry, Hardnett, Mballa, Grant, Segu, Williams, Skogman/Brock. This isn't necessarily a rank order, but somewhat of the presumed lineup based on the original post of this thread. Based on that, it's not super far off depth-wise. Player for player, it could look like this:
CJ - Johnson (we're all hoping for big things from Johnson, but this is a 4th year CJ, edge to CJ)
Graves - Graves (edge to this year's version)
Jordan - Jordan (edge to this year's version)
Harris - Nickelberry (again, we all have high hoped for Nickelberry and I would be more than happy to get a push for this year)
Perk - Mballa (this year, I'm definitely going with a 4th year Perk)
McRae- Hardnett (without having played yet in college, we can't be sure, but could definitely use Hardnett to be a win here)
Caruthers - Grant (not the same position, but Dontay brought us some huge things last year. Hoping for some nice things out of Grant, but giving the edge to #22)
Williams - Williams - (edge to this year's version)
Segu - Segu - (edge to this year's version)
Fagan/Brock - Skogman/Brock (I'd probably take this year's)
Breaking it down that way, it doesn't "seem" to be a crazy idea. What can't be assigned is the cohesiveness of last year's group, many of whom played together for at least 2 years. Many of this year's group is new and it may take time to get rotation, roles, understanding of each other.
Regardless, it should be a very strong team and one that I greatly look forward to seeing play.