I agree with Ford it's unlikely that Shelley, knowing Gloria Calvary, would bungle the details of this specific event; Lovelady has no info at all about her (or Baker/Truly) in his affidavit.
In the testimonies Shelley/Lovelady are in perfect sync RE Calvary reaching the stairs prior to trier moving to the "little island" where they watch Truly/Baker enter the building at the 3 minute mark -- WHAT?
How could Calvary possibly reach the front steps prior to Baker who allegedly was there 15-20 second post shots?!
Exactly, Mr Beck-----------thank you!
Now.............. The EFFECT of Mr Shelley's change of story is to
keep him and Mr Lovelady together on those steps. Has Mr Shelley changed his story in order to help Mr Lovelady out in some way?
Alternatively............ Is his affidavit story (which invites corroboration from a personal friend, Ms Calvery) a lie whose purpose is to cover his own true movements/actions in that crucial first minute after the shots rang out?