I'm going to stick my neck out and say that's not normal. I don't know what it could be.
But thinking aloud, #1 pendulous crop shouldn't keep him from roosting, #2 in my short experience w chickens, none have had pendulous crop, plus I thought that it was a hen's ailment?
#3 I once had a large brood of chicks that started roosting on a wire fence, and I let them. The fryers all developed breast blisters, which were pretty gross during processing, but never kept them from roosting. The biggest blisters were the size of my two thumbs together, with maybe 1/4 -1/3 cup of fluid in them. I changed the grow out pen set up.
#4 it's not fat, my Basques and the Basques of friends I've seen are lean, with almost 2/3rds leg-thigh meat to breast meat. Raising the cockerels as capons will result in fat distribution on the leg-thigh and heavy deposits of fat in the pelvis and around the gizzard.
#5 The 'poo spot' looks like part of him, to me... I hope I'm wrong, but something tells me he's a short timer.