Johnson is much the better overall, but I think his style is all wrong for Johansson. A passive, defensive fight plays into Ingo's hands. It strikes me it will be a dull fight with Ingo circling and Johnson not pursuing. On film Johnson seems vulnerable to overhand rights. Whatever else, Ingo had a right. I can easily see an upset and in fact would predict one.
I think I’d favour Johnson, because he’s just the better fighter in innumerable ways, but I definitely take your point. His style doesn’t help, & I am skeptical he can absorb Johansson’s best punch. A Johansson victory is very plausible.