While their new friends are planning to leave the planet, these guys are all going to remain on Motavia. It should be no surprise - all of them were there at the beginning of the story. Chaz, Hahn, and Gryz all have homes to which they can return and lives to rebuild. Rune must continue his training as Lutz - even overcoming the source of all of Algo's evil is not good enough for this wizard.
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I hadn't noticed, but you're right. He has an awkward expression there. Maybe he was tacked on later, after the others were done, but Hahn was taken from another image.
Aha! You're right Kaloes, that's where it is from. Nice catch - I overlooked that one completely. The shading on Hahn has been changed, so it is not a straight copy. Looking at them together makes it obvious that they reused Hahn, though.