Who is OKC's biggest threat in the west now????

Now that Luka is gone I don't see the Mavs being in the playoffs (and even if they are once okc is fully healthy the mavs not having Luka means Lu Dort is likely going to be guarding PJ Washington all series). Houston (as of right now) doesn't have enough offensive firepower to beat us 4 times out of 7 games. Memphis all-around is just "meh" to me. The only team I could see us having even the smallest of issues with is Denver and even then if we have both Chet and Hartinstein healthy I feel like that series ends in 5-6 games..... So who is OKC's biggest threat in the west???? (Yes this is a serious question)