Zach's most recent playoff experience was 8 years ago against Dallas. He has very limited playoff experience and has never won a series.
Tony Allen and Shane Battier have a lot more post season experience, have been in the playoffs much more recently, and have been on teams that have advanced multiple times.
That said, I don't see the Grizzlies making it to the WCF. It will be a tough series against the Spurs. Even if the Grizz get past the Spurs, I don't see them getting past OKC.
BNM