Empirical reason:
<set name="Cure" baseset="idle">
<hands>Augur Gloves</hands>
</set>
<set name="Idle">
<hands>Serpentes Cuffs</hands>
The Serpentes Cuffs never equipped. So, there is empirical support.
Theoretical reason:
As grev said, SC doesn't equip > check > equip. SC determines the equip prior. Here is a look at the debug chat:
Code:
[10:30:20 PM] 2252:<0> ========== Modifying Precast =========
[10:30:20 PM] 2252:<0> Changed Back to Umbra Cape
[10:30:20 PM] 2252:<0> Changed Body to Dst. Harness +1
[10:30:20 PM] 2252:<16> Changed LEar to Darkness Earring
[10:30:20 PM] 2252:<0> Changed Legs to Tatsu. Sitagoromo
[10:30:20 PM] 2252:<0> Changed LRing to Dark Ring
[10:30:20 PM] 2252:<0> Changed Main to Earth Staff
[10:30:20 PM] 2252:<0> Changed Neck to Twilight Torque
[10:30:20 PM] 2252:<0> Changed RRing to Dark Ring
[10:30:20 PM] 2252:<0> Finished Modifying Gearset for group Abyssea-R set PDT
[10:30:20 PM] 2252:<0> Modifying Gearset for group Abyssea-R set PDT
[10:30:20 PM] 2252:<0> ========== Modifying Precast =========
[10:30:20 PM] 2252:<0> Changed Body to Estq. Sayon +2
[10:30:20 PM] 2252:<0> Changed Feet to Serpentes Sabots
[10:30:20 PM] 2252:<0> Changed Hands to Serpentes Cuffs
[10:30:20 PM] 2252:<0> Changed Head to Duelist's Chapeau +2
[10:30:20 PM] 2252:<16> Changed Legs to Nares Trews
[10:30:20 PM] 2252:<0> Changed Sub to Pax Grip
[10:30:20 PM] 2252:<0> Changed Waist to Hierarch Belt
[10:30:20 PM] 2252:<0> Finished Modifying Gearset for group Abyssea-R set PDT
[10:30:20 PM] 2252:<0> Modifying Gearset for group Abyssea-R set Idle
[10:30:20 PM] 2252:<0> ========== Modifying Precast =========
[10:30:20 PM] 2252:<0> Changed Back to Estoqueur's Cape
[10:30:20 PM] 2252:<0> Changed Body to Heka's Kalasiris
[10:30:20 PM] 2252:<0> Changed Feet to Rubeus Boots
[10:30:20 PM] 2252:<0> Changed Hands to Augur's Gloves
[10:30:20 PM] 2252:<0> Changed Head to Estq. Chappel +2
[10:30:20 PM] 2252:<0> Changed LEar to Novia Earring
[10:30:20 PM] 2252:<0> Changed Legs to Nares Trews
[10:30:20 PM] 2252:<15> Changed Main to Arka IV
[10:30:20 PM] 2252:<0> Changed Neck to Orunmila's Torque
[10:30:20 PM] 2252:<0> Changed REar to Roundel Earring
[10:30:20 PM] 2252:<0> Changed Waist to Witful Belt
[10:30:20 PM] 2252:<0> Finished Modifying Gearset for group Abyssea-R set Idle
[10:30:20 PM] 2252:<0> set loaded from inherit
[10:30:20 PM] 2252:<0> breaking
[10:30:20 PM] 2252:<0> exiting for when checking for group Outside-R
[10:30:20 PM] 2252:<0> entering for on sets with group Outside-R looking for Cure-Potency
[10:30:20 PM] 2252:<0> Loaded the set, now modifying gear set
[10:30:20 PM] 2252:<0> ========== Modifying Precast =========
As you can see, "Hands" was set to the baseset (Cuffs), but SC later changed that to the cure set (Gloves). In other words, SC parses the rules prior to doing any equipment modifications. In this case, I removed the gloves from my inventory, so I kept my original EMP+2 equipment equipped.