Quoted from Shadow:
Can Keith have others help with coding or does he personally need to write every line?
I've had this thought also, not just about WOZ but in game development of the past. Knowing very little about software, I always imagine there's a lot of grunt work involved to writing code(copying/pasting, rearranging, debugging etc) which could be delegated and overseen, while the lead software guy continues with the writing and creating, speeding up the process.