Halo coming to PlayStation is one of those events that, five years ago, would have been the tell that “something is not right here” in a show about time travel or alternate universes. Looking at the state of Xbox with its layoffs, game cancellations, price hikes, studio closures, and a soft release schedule light on attention-grabbing titles, it certainly seems like all is not well. But the company’s focus on tearing down the walls of its garden by multi-platforming its biggest exclusives combined with a push to make Xbox games playable on just about anything, denotes a strategy that may be what keeps the green guys in the game for a while l …