The first quote tells you that Michael didn't lie when he told Harry why he wouldn't attack without warning. But that he had thought about the possibility that Harry might lead them into a trap..
Okay, so to be perfectly clear, since I've misunderstood some of your posts before: I take this quote to mean that Michael didn't lie about why he refused to hunt down the Denarians to kill them (against the rules of his job) but the reason he didn't say "but I will help look for them to rescue Marcone" is because he was concerned about Harry leading them into a trap; and I take your posting of the quote in the context in which you did so to mean that you agree with me.
The second quote is about who actually picked up on the problem, Molly not Michael.
I've always been confused about that, because as I understand the order of events, there was no point at which Molly should have gotten suspicious until
after Michael refused to go hunting Denarians.
But it helps with context...
...I'm not seeing it. It's like saying "Well, in Changes when Harry's apartment was set on fire, why didn't he just use ice magic to put it out? He could do that later in Changes," with the answer being "yeah, but not at
that point he couldn't." It doesn't feel like context to me--more like confusing the issue. There was no indication at the point I'm talking about that Nicodemus was setting up a trap by kidnapping Marcone--that came later.