PTR warlock question

So for the 2/4 set for diabolist warlock I took mine on PTR but couldnt get the occuli to show up, even went into demonology since it seemed to be the easiest to proc. My question is, when it says “hand of gul dan cast at maximum soul shard will spawn a demonic occuli” is it referencing the maximum shard count for hand of gul dan to get full damage/imp spawn value or does all 5 shard slots have to be full?