I think Horner was a better all around PG on a better all around team. On a team like this, I think Cartwright is a better fit and helps us more than Hornere could. Cartwright can create his own offense and this team desperately needs that. And yes I do think that Cartwright can put this team on his back better than Horner could, and that is not saying he is a better player or all around pg.
Horner put the team on his back for the entire Big Ten tournament. I think you may just not have seen him play much. Dude consistently hit the big shot when it was needed.
I watched that undefeated home season. When the team needed a shot, Jeff constantly delivered. Bryce was very much hit and miss in that department.
I think the issue is that you don't see anyone else on the team today that can do that. This is true. But that shouldn't diminish Jeff's contribution.