If I were Carlton I would build your spine first. I think it's been proven time and again that having a good spine is far more important to a team's success that having a gun midfielder. If you keep picks 1 & 2 (assuming Kruezer walks and you get a band 1 compo pick for him) you could land both Schache and Weitering who could be your bookends for the next decade.
And I really can't see the Blues being an attractive proposition for AT. He is currently at a club who is on the verge of successful era, and of the two clubs leading the race for him one is on a similar trajectory and the other is competing in finals this year (I haven't studied the list closely enough to assess it's future potential, sorry). The Blues are headed from a ground up rebuild, so it's going to take a few years before any real success is likely.