Ilberd seems like he'd probably be the most likely person who would try to get people to go get Ala Mhigo back like The Griffin is doing, but I doubt he'll try to summon Rhalgar...
They wanted the crystals to trade them to the Amal'jaa in exchange to get them to help in a fight to take back Ala Mhigo.

My guess for 3.5's main plot points being that The Griffin's identity gets revealed, he uses Nidhogg's Eyes in some matter, goes off to Ala Mhigo to horribly fuck up the Empire's troops there and we have to get ready to go to the Gyr Abania region where Ala Mhigo is located in 4.0...