I've been using the reprised 1.0.2 IKELOS weapons and they are creating Warmind cells. One thing that many forget is that the weapons that can create Warmind cells will only do so if there is also a mod equipped for creating Warmind cells. The go to easiest one is Global Reach, which has no elemental affinity and extends the blast radius. You can equip it on any armor piece with a Dawn, Worth or Arrivals seasonal mod slot. Other non-IKELOS and non-Seraph weapons can also create the cells with the right setup. Sunshot and Xenophage, for example, can create cells when Wrath of Rasputin is equipped.
Ikelos weapons ≠ Seraph Weapons