First, the shape of the business
Where does your business actually live?
There's no wrong answer. It just changes where the seams tend to hide.
Now the painful part
Which of these is held together by hand right now?
Pick the one that, if it broke tomorrow, you'd feel by lunch.
Last one
If it had to run without its main person next week, what happens?
You already know the answer to this one. That's the point.
Reading your situation
Tracing where it leaks.