I'm a little shocked that anyone would think that the most important characteristic/ability of the lead actor would be how closely he LOOKS like Steve Jobs..
While the depth of the movie is important too the lead character NEEDS to highly resemble Jobs or most people won't be able to relate to him or easily identify him. I've seen a few actors doing a story of a high profile person's life and they either didn't sound like that person or look like that person and it really brought down the value of the movie.