Beta_Force
he should absorb yoriichi somehow to gain his "abilities" like his resistance to sun breathing(he is resistant to the sun somehow) and be able to use sun breathing. Also with the red aja he will gain hammon and since hammon imitates the sun, then hammon + sun breathing should make an even better "sun" technique that trains the body and also gathers energy, but the energy is stronger than before and more refined than normal hammon due to sun breathing and the body and vitality also stronger than just the sun breathing due to hammon(since hammon users live longer that means it increases the vitality).