1. I've never believed that President Trump was ever really concerned about the Mueller investigation. Read into that what you may.
2. I'd say there's a pretty good chance that Mueller isn't even really investigating what everyone thinks he's investigating. The evidence for this is that we now know about FISA surveillance dating back to 2016 ... and yet he hasn't filed a single criminal charge against anyone in the matters related to that surveillance.
Yes, they go far out on limbs.
I agree with both of your points.
One advantage of spending 40 years in the media bubble/spotlight of NYC is that Trump has already had lots and lots of scrutiny. So the idea that these spyweasels are suddenly going to find huge dirt on him is ludicrous.
Because he knew any evidence arising from it was going to be tainted, and ultimately thrown out. That's why his current target is Flynn's discussion with the Russian Ambassador, which is the never before prosecuted Logan Act but was captured under a separate surveillance mechanism, and Trump's possible obstruction trying to get Flynn off. Throw on top some DonJr talking to a Russian lawyer, but that was probably a setup by Fusion GPS. Mueller is working every day on those angles, and hoping to perjury trap Trump like Starr did WJC.