They're not a passing team, clearly - and their two best passers are old men who can't bring it every night - so Kawhi needs better shooters around him for one, and not just shooters who do only that. Guys like Mills, Forbes, Bertans, etc, who do only one thing on their best nights are not enough against GS and possibly the Rockets.
We need more guys like Gay and - sigh - even Anderson who can play multiple positions, compete on both ends, and make plays. Standing around while Kawhi and LMA force the ball into the basket while the other team bombards us with 3's is not enough.