So I haven't seen anyone talk about this yet. But in ch 6 Dalinar says this about Ishar:
"Ishar thinks he’s the actual champion, not me. Either that or he thinks he’s the Almighty himself… probably some crazed mix of both."
This, combined with the prologue being changed to have the "Stormfather" talk more about a Champion, makes me think it's even more likely Ishar is the Stormfaker. Just more hints towards Ishar having seen a vision or something of the need for a champion.