I'd disagree with that.
St. John's has played solidly against zones this season. Last night, they didn't defend, which means they didn't get transition opportunities - first issue. Last night, Justin Brownlee couldn't find the range, taking away the inside offensive game; he has struggled against man and zone - second issue. Third, Seton Hall defended Hardy really well.
I think zones slow the team down, but I think length is more important to defend the storm.
And you may not know this, but Seton Hall is one of the best defensive teams in the Big East, maybe in the country. A lot of teams struggle against them.