I agree, at least emotionally. I was very sad when Rob left. He really brought something special to Arena. He has a certain dramatic tone in his voice that no other Arena vocalist has.
That being said, every vocalist was really good. And technically, Paul Manzi is probably the best of them all. I don't think Rob could have done "The Seventh Degree...", but noone delivers "Contagion" like Rob.
Kudos to Clive and co for having the perfect singer for each album.