I have nothing to support it just my take on Iginla's character, but I think he doesn't want to come back out of respect for Gio. He knows it would be a huge distraction and media and fans might bypass Gio and go to Iggy as "the Captain".
Think of the whole Messier/Linden thing with the Canucks.
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Calgary Flames, PLEASE GO TO THE NET! AND SHOOT THE PUCK! GENERATING OFFENSE IS NOT DIFFICULT! SKATE HARD, SHOOT HARD, CRASH THE NET HARD!
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