No, he goes "outside to watch P. parade". Not difficult!
But what has this got to do with what Mr Rowland saw?
If you would admit that Prayerblob just might be Sarah Stanton, and thus is not in the way of the front door, where she would have been if she was with Pauline Sanders initially, THEN it might be a little bit easier to have Oswald slip out behind people and be just BEHIND BW Frazier, rather than in front of him, which might fit your partial face seen in Altgens photo 6.
But if you keep insisting that Oswald must be just behind Lovelady and just in front of BW Frazier, there is NO way I could ever go with that given the probability of Oswald being seen moving INSERTING himself between people as opposed to simply BEHIND ALL of them, just peeking.
See, if Oswalds position is just to right of Prayerblob, and also behind but just to the left of BW Frazier, then it might explain a little better the idea of a black swath that did NOT blacken out Prayer blob and only slight portion of Billy Lovelady
And then the 2 head phenom, can be dismissed as motion blur for a fraction of a second, and that would explain no blackened out portion of that 2nd head since the conspirators probably looked at it and saw it was NOT INDENTIFIABLE as Oswald anyway. The main thing was to get rid of A BODY which would be there just to the right of Prayerblob, and just to the left of and maybe close too, but just slightly behind BWF and Bill Shelly.