I really have not heard too much about Flowers, but this Rivals article (behind paywall?) quotes him saying how UM is definitely one of his official visits. He's the top player in AZ, 4 stars, and ranked as the number 9 overall athlete on Rivals. The article also states that Flowers is in consistent contact with Coach Dews.....Looks pretty impressive.
At press time, Harbaugh had sent Michigan’s athletic department an envelope containing a heavily annotated seating chart, a list of the 63,000 seat views he had found unsatisfactory, and a glowing 70-page report on section 25, row 12, seat 9, which he claimed is “exactly what the great sport of football is all about.”