I'm still a fan of the dual time-ilne, MiB = William theory, even though there are holes in it. It just seems like it's set up to be the big reveal.
First you have William, the man-in-white do-gooder whose afraid to let loose his inner id, which is the direct contrast to the MiB.....so it's like he's slowly breaking bad. The transition from MiW to MiB makes for nice bookends.
Then you have the latest episode when MiB is talking to Ford and basically reveals that his wealth is what saved Westworld sometime in the past. At the same time, you have Logan telling William how sources say Westworld is hemorrhaging money, and they are there to see if Westworld is worth buying out. This would fit neatly into the "past" timeline where William will at some point decide to "save" Westworld by having his company fund it. Even though he's only an executive vice president, it seems like the storyline is set up where he will move up the ranks in his company, possibly by usurping/supplanting Logan, possibly because his wife (Logan's sister) may be in line to inherit the entire company should something befall Logan, and therefore William would stand to inherit the company through his wife.
Again, lot's of interesting plotlines in the show, just hope they don't fuck it up like Lost.