Congrats on saving the poor little guy!
First..I have to tell you that you took a big chance introducing him so fast to your other chin. I always recommend a quarantine period. Minimum 2 weeks. Are you sure you have a same sex pair?
Ideal situation would be himself alone in a new cage with lots of good food, toys etc and then just let him be. Sit by his cage and read and/or talk to him quietly. Do this for a minimum of a week. Stressing him out by picking him up with gloves will set you back tons. Because of the treatment he previously received, he may never come around totally but hopefully with quiet time with you and an occasional treat, he will learn to trust you. Once he is calmer in a few weeks, try taking him out and playing with him on the floor in a small room such as a bathroom (toilet seat down). Let him climb on you and try not to force yourself on him.
If your other chin is tame, he may learn in time from example. When your other chin runs up to greet you, he will see and sense that you are o.k. Just give him time.
Caretaker of 2 dobermans,, 1 schnauzer, 5 cats, 3 goats, 1 parrot, 1 bearded dragon lizard, 11 chinchillas.
Rest in peace, Cricket, Casey, Bella, Yank, Chloe and Bones.