In most of the poses they are evenly matched, but Nathan destroys him in the 2 from the back, therefore, he is a clear winner for me.
Agreed on the BDB, I´d call the rear lat spread equal, De Asha has more detail, Marcello a wider back and better hamstrings and calves. I´ll argue Marcello´s case in the rest of the photos:
Photo 1, Front Double Biceps, Marcello clearly wins, he´s just the bigger man, bigger arms and legs.
Photo 2, Front Lat Spread, I´d say a draw, De Asha has better shape and Marcello has a really blocky waist in comparison, but his size and legs make up for it, he also has better calves, I hope he was caught in transition because his hand position makes him look a bit goofy posing like that.
Photo 3, Side Chest, Marcello wins, he has a tad more detail in the obliques and better legs.
Photo 4, as stated De Asha clearly wins.
Photo 5, as stated a draw.
Photo 6, Side Triceps, Marcello has bigger arms and legs and more detail in the obliques.
Photo 7, Abs and thighs, Marcello´s wheels win it for him.
Photo 8, Most Muscular, Marcello wins this too, simply bigger.