RealGM has quantified how much Beilein's teams get better after Nov/Dec. Really interesting.
If you are looking for a coach whose team typically does get better later in the year, look no further than Michigan head coach John Beilein. In 8 of the last 10 seasons and for six straight years, Beilein’s teams have seen their Pyth. Winning Percentage improve after the opening two months.The link contains a helpful chart showing the degree of improvement.