What do they all have in common? None of them likely existed in my opinion.
However the WT will claim Mark did know Jesus since he's the streaker running around when Jesus was arrested lol.
Mark 14:50-552 NWT
50 And they all abandoned him and fled.+ 51 However, a certain young man wearing only a fine linen garment over his naked body began to follow him nearby, and they tried to seize him, 52 but he left his linen garment behind and got away naked.*