You say never use his E to engage, I get what you mean but his E gives the armor pen that you need to get a clean kill, if u engage with an E u wont need to use it later bc the guy will be dead

I use to play Darius jungle and i can testify that this build totally works.
How do you think about Righteous Glory? I put it instead Sterak,I find it very good because the passive is a ****ing good tool to gank and you're not less tanky because it still has 500 LP.