First of all: It's a Cavs pick with no concensus at the slot...
2nd: His asthma should have been known predraft when they get their medical checks from the league.
3rd: How does asthma and sleep apnea or whatever the other thing is influence the physical work a player can do?
4th: I'll give him some time. Being a rookie is never easy. Battling for minutes with Tristan Thompson doesn't make it easier. He was injured preseason, and he's trying to play catchup with the rest. He should have done his conditioning in the D-League to have more practice time and get some playing time that features him as a main option to regain confidence and rhythm. Then bring him to Cleveland and give him a chance to be a solid rook.