Elon Musk is having a hard time selling the idea that Tesla Motors buying SolarCity is just the "obvious" thing to do.
Even Adam Jonas, the Morgan Stanley analyst who once jacked up his target price for Tesla on the basis of an imaginary business, isn't buying it. As of now, SolarCity's stock trades 8 to 15 percent below the implied offer, suggesting the deal's inevitability is anything but obvious to investors.