1. Does Raymond think that debugging is easier or harder in an open source project? (Compared to traditional development.) Why?

He says that debugging is much easier.

Reason: Many people will be looking over the code and suggesting fixes; or All bugs are simple, if enough people look at them; or Debugging is parallelizable; or All bugs are shallow with enough eyeballs.

2. Raymond claims that traditional managers are not needed in open source development. My reply disagrees with him. Why do I think he is wrong?

I think Raymond is just replacing the traditional manager with the open source project leader. or,
I claim that the project leader (such as Raymond or Torvalds) does all the same things that a traditional manager does. or,

I take Raymond's list of the things that a traditional manager does, and show that Raymond and Torvalds did all these things themselves.