Oswald most likely but..
Dougherty was closer to the scene, acted out of character, had no alibi (the one person who he said he spoke to failed to remember him), his testimony was totally garbled, was former military, was not seen by anyone else moving about the 5th/6th floors...Why wasn't he at least properly interrogated as an accomplice??
Explain how JackD 'acted out of character'
Jack took the elevator to the first floor as soon as he heard the 'first loud noise'
Bugliosi:
'Jack Dougherty, another Book Depository employee, gave an
affidavit on the afternoon of the assassination that he also saw
Oswald ?on the sixth floor shortly before noon? (CE 2003, 24 H 206).
However, Dougherty, being somewhat mentally retarded, doesn?t have too
much credibility. In fact, the very next day he told the FBI he did
?not recall seeing [Oswald] at work after 11:00 a.m.? (CD 5, p.366)."
-- Vincent Bugliosi; Page 461 of "Reclaiming History" (Endnotes)
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"Depository superintendent Roy S. Truly told the Secret Service
that "although Dougherty is a very good employee and a hard worker, he
is mentally retarded and has difficulty in remembering facts, such as
dates, times, places, and has been especially confused since the
assassination." .... Obviously, Dougherty is not the kind of witness
one can rely on to substantiate whether Oswald carried a package into
the [Depository] building that morning [11/22/63] or not." -- Vincent
Bugliosi; Page 820 of "Reclaiming History"
Tell us why conspirators would rely on JackD to pull off a shooting; or why he himself would be motivated to do it on his own.