#1 Impact is Jericho:

This one is a no-brainer. Out of all the possibilities, this one is the most probable to happen. After all, Impact Wrestling is currently run by Scott D' Amore and Don Callis, who have been friends with Chris Jericho for the last two decades. In fact, it was Jericho who asked Anthem to bring in the duo to save their sinking ship.
Ever since leaving the WWE after WrestleMania 33, Jericho has shocking all around the world by making impromptu appearances at shows and attacking other wrestlers at will. Jericho is currently scheduled to defend his IWGP Intercontinental Championship against Evil at Power Struggle on November 3.
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But if Jericho's recent actions are anything to go by, he might show up at the Impact Zone on Bound for Glory. Jericho has lately been stressing on the fact that it is cool to not for Vince McMahon anymore. His appearance at ALL IN shocked fans as Jericho has categorically refused to work in North America for any promotion other than WWE.
But that all seemed to have changed and Jericho now is open to working with any promotion. Jericho has collaborated with Impact for his cruise and the company has been mentioning the name of the Fozzy frontman for quite some time now. If Jericho does show up at Bound for Glory, expect nothing but fireworks.