Correct me if I am wrong here.
Public only became aware of stills of 2 other people in addition to MIB after an article was published in Kildare now. The origin of these stills is from the guards. The still which in itself contained the most clear image of MIB was not in the public domain for all these years. I think you are giving the guards too much credit here. These 2 men were hanging around the gates for 36 seconds and were standing feet away from MIB and they cannot say if he's 30/40/50 years old, do a photofit, describe what he was wearing.
We know we have Karl Pender who was working, Peter the security guard and 2 random individuals who shall remain nameless. Who I might add were standing feet away from a man who we are now changing our investigation into the disappearance of TD to a suspicious death and offering 100k reward. We dont have one scintilla of information about these 2 people other than a line from Garda press officer saying that they investigated them, nothing to see here, there are not part of our enquiry. Do you not think this is odd and why have these images only been leaked now. Its a pretty big leap to have confidence in the guards who have displayed amazing levels of incompetence to date and were it not for a Conleth Loonan (a friend of TD) we would not have any images to go off.