another leak question (727)

Front seal is leaking on my 727 so I'm in the process of dropping it. When I pulled the drive line , fluid started leaking from the tail shaft , it wasn't leaking before I pulled it. the fluid had been collecting in the drive line input shaft. Could the fluid be finding its way back from the front seal? I know there are all kinds of possibilities for leaks but nothing else is leaking but front and back . I also had thought that the drive line may have been in too far. I marked it before I pulled it and it was in three inches.IMG_20180113_135041023.jpg