Giant TCR Advanced ISP Frameset

Price drop to $650 shipped
.

Let’s try $600 shipped OBO.

Now $550 shipped OBO
.

So I am looking at these frames and the TCX frames. Thing is I just don’t get the sizing scheme. A 57cm ett frame that has the seat rails at 73 cm is for a 6’2 guy with like a 31-2" (short legs) inseam yes?

I am 5’9-1/4" with a 32 ish inch inseam (slightly long legs). My 54 inch slice fits lovely with a 120 stem and the rails are at 72.5mm center of BB. ( Cobb V flow saddle so add 1cm to rail height with regular saddle).

I see you have ebay auction for the tcx. I am into that frame but can’t get the sizing thing straight.

Any guidance?