Not really, risp. When the pylon gets knocked offline through any means, including destruction within the pylon, it would stop the resistance to planeswalking. Thus making free planeswalking for all!
Xion does have one weakness in his current state...and if you actually think about it, you could make Xion, Diesel, Malta, and Tia your mindless slaves. You just gotta capture them.
And how can you capture them when you have no return ticket? 
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