If Bakers part of of his story concerning why he headed towards the TSBD is true , then he probably was headed for the front entrance door of TSBD as he got off his motorcycle.
ON THE WAY to those front steps, perhaps was when Bakers path changes slightly as he notices the woman holding the bag.
That slight deviation might not be able to be to so clearly discerned from just the 2 blue computer model lines that Mr. Hackers 3d model that suggest an absolute straight line trek.
So it’s possible Baker did stop for some few seconds of time to see what the bag woman was holding was.
That time delay could have allowed Mr Truly to have joined up with Baker or even for Truly to have ascended the west side steps and enter the TSBD foyer ahead of Baker, who probably came up the east side of the steps (from leaving the woman w/ bag).
Thus may explain why Molina only saw Truly while Sanders only saw Baker.