I heard in an interview at some point that the covering/not covering of tattoos was not for continuity reasons but more because the tattoos should fit the character. so basically the entire season they covered up the chest piece.
i love that they did it - probably to save time and makeup that is spent on covering it up, but i like how they did it, too. it’s definitely not a tattoo CASSIDY would get, and they knew that. So when Tulip saw there were words and not just an image she asked, “what does it mean?” to which Cassidy replied, “what do you mean its a bird” or however the line went.
The point is - CASSIDY has no idea what the tattoo means but Joe does. Because the tattoo makes NO SENSE for Cassidy, but makes sense for Joe. And it makes PERFECT SENSE that Cassidy WOULD go out and get a spur of the moment tattoo without any thought or consideration or care as to what the writing on it actually means; he thought it looked cool so he got it, case closed.
So it works. Cassidy did a very Cassidy thing and got a tattoo for no reason with no meaning to him other than it looked cool, Joe did a very Joe thing and got a tattoo that most likely DOES mean something very significant to him, because thats what he does, and they’ve reached at that middle ground to where it can be shown in the show.
(side note: i did notice that they are still covering up the ‘agony’ one on his hand - perhaps they will get tired of covering that one, too, and introduce it later on).