In Proven Guilty, Harry pulls up his sight to inspect the bathroom where Pell was attacked and he confirms there's something "spooky" at work. Would he have been able to use his Sight to look at Luccio in Dead Beat to confirm his thought that Corpse Taker took over Luccio's body? I know it was a spur of the moment decision, but if given another couple of moments, would he have been able to do it?
We know Murphy had a blazing angel look to herself through Harry's sight.
I figure Luccio would've had something recognizable (Not that Harry would know what to look for after the body switch--something tainted maybe?)