At this point I'm not positive Dusty/WWP had a solid end game, at least not in the day leading up to the reveal. My hypothesis:
WWP, who knew Phil in college and likely is Dusty, joins the Farms to be petty about this guy. If what he said as Dusty is true, then Phil in those days gave his ego a nice fat boost and he misses that. For a while, reliving the glory days was enough.
WWP starts to regret not being out as Dusty and/or starts to feel bad that Phil is constantly shit on. He is, after all, his white knight.
WWP creates the Dusty account here and probably the Joyce account on FB as his 'reason' for finally joining. . .but then fucks up a bit and says he joined to defend Tweaker, which he then doesn't do.
Dusty goes on and on about how he doesn't really like us and Phil's not so bad, he just needs Dusty to save him, blah blah blah. People start getting aggressive with him in his AMA, Dusty starts trying to appease us by saying when Phil flips out, he'll give us caps, which is directly in opposition to his earlier white knight position. That seemed fishy to me but I didn't say anything at the time because I'm not funny like Dynastia. This really highlights how fickle Dusty is. I definitely agree with the savior's complex. . .and I see the narcissism element too.
Because everything falls apart after this as Dusty tries to be the mega-hero, to best serve himself.
Dusty continues trying to save Phil while also saying Phil can't be helped in a poor attempt to please both Phil and us.
Dusty really, really wants us pleased because he probably realized he can't come back as WWP and he was banking on us to literally be his bank. What he doesn't realize is he's trying to juggle three or four narratives at once that do not work with one another. If he saves Phil, he condemns the Farms and his 'friends', if he plays nice with us, he can't save Phil. He definitely wasn't thinking end game then, though he might have at the start. By the time he was revealed he was panicking, not planning.