I don't think the focus is on Memphis.  In fact, I wouldn't be surprised if they win the rest of their games on their schedule:  LAC, SAC, NO, POR, and LAC again.

So here's the situation and prediction...

HOUSTON (41-36) REMAINING SCHEDULE:

TUE 05 VS SAC (42-36) Most likely win.
WED 06 VS NO (43-36) Tough game, can and MUST win.  We're 1-2 with NO in relatively close games.
SAT 09 VS LAC (44-36) Most likely win.  We're 1-1 this season in close games, but have home court advantage and they're coming off a back-to-back with the Mavs.
MON 11 VS DAL (44-37) Could win.  We're 0-2 on DAL this season, but close games.  Let's just assume the loss.
WED 13 VS MIN (45-37) Likely win.  We're 2-1.

ROCKETS FINISH OUT WITH PREDICTED 45-37 SEASON

NEW ORLEANS (44-33) REMAINING SCHEDULE:
WED 06 VS HOU (44-34) See above.
FRI 08 VS PHX (45-34) Winning record with PHX, NO wins.
SUN 10 VS MEM (45-35) They're 2-1 against MEM in close games, but I think MEM is playing better ball now as evident from their game a few days ago. MEM wins.
MON 11 VS UTA (45-36) Pretty even match this season, recently won a close one.  However, UTA wins since NO is coming off back-to-back with an important game against MEM, UTA surprise win.  UTA is also rested for a day.
WED 13 VS DAL (45-37)They've had zero luck against DAL, not even close.  DAL wins.

HORNETS FINISH OUT WITH 45-37 SEASON AND MAKE PLAYOFFS DUE TO DIVISION STANDING...SUCKS.

So In my opinion, all eyes are on that HOU/DAL game.  That could be the deal breaker there, where HOU can end up with the 46-36 overall record to unseat NO which means HOU must win every remaining game.  It's possible, but extremely difficult.