I like Lenny Kravitz. I think he has a style and coolness about him. In all honesty can be a little frustrating at times, his album tracks tend to be a bit weak. His singles tend to be his best work. But he writes superb singles.
But When he is on form, he is a great singer, talented musician. Usually plays every instrument on his albums. His singles are superb From Let love Rule to Rock n' Roll is dead...his collaboration with Slash on Always on the run...And he wrote Justify my love for Madonna. He has an awsome CV.
As a front man of a super group i think Lenny would find his place, the co-writing with a good songwriter would bring out the best in his lyrics and he looks the bomb as a frontman.