You raise an interesting point. I don't believe that, if there was a conspiracy, Oswald could have been framed without some involvement at some level. Having said that, I have to take issue with the notion that it was vital for Oswald not to have an alibi. IMO it wouldn't really matter if he had an alibi, when the conspirators also control the cover up.
The assumption that people would be willing to come forward and provide an alibi for Oswald ignores the fact that the people were terrified. Brennan said he did not identify Oswald at the line up because he was afraid and feared for his family. Consider the circumstances; most witnesses of a serious crime don't come forward easily and voluntary. And this was the murder of a President! If he could get killed, so can anybody else, right? And then, two days later, Oswald gets killed, which means he no longer needs an alibi....
But even if some witnesses did come forward and provided an alibi for Oswald, just how easy would it be to conclude that those witnesses were simply wrong. Just like they said that Carolyn Arnold mistaken. Even if Oswald had an alibi, it still might not have done him any good.
Just have a look at what happened to Richard Rosario who was convicted of murder and spent 20 in jail for a murder he did not commit and could not have committed because he was in another state when it happened. He had 13 people who provided an alibi for him.
https://www.courthousenews.com/wrongfully-convicted-man-blames-nypd-for-unfair-trial/
And as for Oswald possibly being filmed or photographed, I'd just remind you that video and photo material has in fact disappeared or was "damaged".
So, no, I don't think that Oswald being seen somewhere else would necessarily be a problem if the conspirators also controlled the cover up.
I'm not so sure Martin.
The Altgens 6 pic is a good example. This picture, which showed the front steps of the TSBD, appeared on the front page of multiple newspapers (hhttp://kennedy-photos.blogspot.com/2013/03/kennedy-gallery-307.htmlours after the assassination)
There was a moment when many people believed this picture actually showed Oswald on the front steps and, as this pic had been seen by thousands of people, it would have exonerated him if it hadn't been Lovelady instead. "They" (whoever they are) would not have been able to contain it.
If (and it's a big if) Oswald was being manipulated it is hardly a great stretch to imagine he was being told what to do to some extent. A simple order of "stay out of sight" and some bogus excuse should suffice.
It is a very interesting fact that many of Oswald's co-workers tell blatant falsehoods between their various statements - Shelley, Lovelady, Williams, Norman and Dougherty (Givens and Jarman to a lesser extent).
If they were just innocent bystanders there would be no need for this "collective" deception. Of course some facts might get mixed up when recounting events, that's human nature, but this goes way beyond a few mix ups.