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+++ If I wanted to evalute who was the most innovative creative GM, I'd toss them 50 million dollars and see if they could win 90. +++
Think that's spot-on, mate.
If I had a team with a very low payroll... there are a lot of worse things you could do, than to let Tango/Cameron/etc see if they couldn't find $30-50M worth of undervalued defense-first scrubs. Am sure you'd see a very admirable run at building a competitive team with limited resources.
That's not to say that a Tango type would be limited to such a paradigm. From what I've seen of his material, he could provide effective recommendations for higher- and lower-end problems...