If you saw 623D come out wouldn't it be better to just 5D 236C? I suppose that's spacing dependent. The problem with her DP is that it can screw you over if it's used and positioned in a bad spot. Say for instance, if Jin does 623D right in your face, you do it, and he's close enough that you can't reliably combo into jD etc. You might even miss a sword and you know where that will end. Also, if for instance you barrier block the first hit of 623D, won't it push Jin far enough away that her DP will miss, assuming you have one primer and are forced to do it.
The most mind-boggling moments for me is when I punish a character directly in the corner, I try to figure out what to do next, but then I realize, 2C is the shit lol. Either way, Lambda's DP isn't something that should be relied on in a pinch. Both CA and DP have their strengths and weaknesses, but I much prefer CA.