I don't think Sekulow would have stuck his neck out unless he had been given some information by someone in the DoJ like Rosenstein that there was no investigation.
This statement is completely incoherent in the context of the prior point you made. On the one hand you suggest that Sekulow should not assume that Mueller and Rosenstein are beyond reproach, then you say that Sekulow should trust someone like Rosenstein if he's told that there is no investigation.
Rosenstein actually DID tell Trump (and the world) that there is no investigation into obstruction of justice, but legally he could not do this directly or even through back channels. Instead, he authored the press release on June 15th that told everyone not to believe what they read in the media ... because the Department of Justice was legally prohibited from confirming or denying any stories about an ongoing investigation. He was basically telling people to turn off CNN and stop reading the Washington Post because they were being fed a bullsh!t narrative about the whole Mueller investigation.
Logic can and should be used to make hypothesis. But he stated in emphatically there was no investigation as a fact, rather than stating it was a strong possibility, and giving the reasons you have posted. If it turns out it is just a hypothesis, and his hypothesis is completely wrong, his credibility would take a huge if not fatal shot.
On the one hand you suggest that Sekulow should not assume that Mueller and Rosenstein are beyond reproach, then you say that Sekulow should trust someone like Rosenstein if he's told that there is no investigation.
That's not what I said at all, I said you were making the assumption that they were above reproach, and following DoJ protocol correctly, in order to further assume there is no investigation.
Rosenstein actually DID tell Trump (and the world) that there is no investigation into obstruction of justice, but legally he could not do this directly or even through back channels. Instead, he authored the press release on June 15th that told everyone not to believe what they read in the media.
Sorry again, but I'm not seeing that. Rosenstein's statement was completely nondescript with regard to the context. Could it have been about the WP article regarding obstruction? Possibly, but that WP came out the day before, and the night Rosenstein's statement came out the immediate speculation was that it was referring to the claim that Jared Kushner was under investigation, which had just come out that same day.
I'd like to believe that the President isn't under investigation, and as of now I take Sekulow for his word, but until we know that it's more than just "logic" and "assumptions" I'm afraid the matter isn't completely settled.