other attribute start,could someone with the knowledge of the CR 2.0 system read this

I wouldn't worry about it.  So you could top out at 54 instead of 60 if you dumped everything into Focus?

I think, based on the inter-dependencies on the stats, that you will not want to do that, but rather split your 89 (total) ability points up between several key abilities.

Even if, say, you wanted to be Focus-heavy (e.g., Focus 39, Belief 15, Vitality 8, Perception 19, Reason at level 50, you can get there from a starting Focus of 5 without trouble.