It's early days and, as you are so careful of his feelings, I think his trust in you will grow. It's a big step to give him a bath, his trust must be growing already. Can't believe he likes the hair dryer, that's great. I think if you want to introduce a brush at some point, just do the chest for a few days, it makes them sleepy. Dylan didn't used to liked to be groomed so I used to alternate one stroke of the brush and one stroke of my hand.
¨°º¤ø„¸Dylan, Poppy & Kipling's ¸„ø¤º°¨
¸„ø¤º°*¨''' ' "*Mummy`` "*'¨°º¤ø„¸