Del Valle fights with his lead hand low already so I think the hook to the body draws his attention towards protecting the body and a couple of things happen: 1. He shoots a left cross and you a) block and uppercut b) block and left hook c) slip outside and right cross 2. He covers up in which case you try to find a home with some combinations and then tie up to wear him down 3. He tries to tie you up, in which case a short right cross are in order 4. He hooks off the jab and in that case there's a big opening for the right cross.

Just my views on it in the manner in which I fight.