I agree I hope Chad makes it. True crack can be one of the hardest to kick only one I know worse is Methamphetamine.
However I know several people who were severely addicted to crack and managed to get off of it and lead normal lives. Nothing is impossible it is just a matter of wanting to change and being sick and tired of living that life.
I do think he has a lot of issues that need dealt with from this past and until he lets those go and works through that he will likely continue to feel a need to self medicate. February to June is not a long time, but it is one heck of a start.
I wish him the best.