Where are you getting 6 rookies from?
McNeill, Danault, Hartman, Pokka.
Scotty Bowman himself said in an interview that it's likely that 4 fulltime icehogs will be Hawks next year.
Teravainen, Nordstrom and TVR aren't rookies to me. But your point stands, Again, I think the Hawks could bring in a defenseman on a 4.5Mish contract (heck maybe even Oduya... not for that much tho). The money is there if you remove Bickell and Sharp from the roster.
Unless you resign Vermette, which I don't think they will, but that basically replaces one of those 2.