Hi leolaia lets get to brass tacks! would the writers have known that the word they used gave no indication of shape beyond it's first translation? which indicated a pale of wood/tree used for execution that would be taken as upright stake with possible additions like you said of a T patibulum or none as in the case of crux simplex? both in my opinion being viable options of Jesus's death instrument at that time?
Latin cross which both you and I know from research has never been an option.
You cannot change the fact that 'cross' indicates a specific shape to the unlearned reader and they would never realise it can mean just a simple upright beam and that indicating shape was not the purpose of the word used originally. 'Cross' used as a english translation is like let me think of an example
stick and crutch both mean a piece of wood, a stick can be a crutch but it is harder to realise a crutch back to a stick by usage the person is saying it is a crutch which is specific in usage beyond just a stick.
you are saying cross can still mean many types including just a stake and yet no one reading the word cross would realise this.
I say stauros/torture stake can mean that a crossbeam can be used or not and the writers knew that the word indicated in no way whether further crossbeams were used and in what way, unlike cross which is the assumption that a crossbeam is DEFINITELY used in the readers mind.
NWT torture stake word has senority in my book as being a closer rendering of the original words used.
in all the dictionaries stake (aka torture stake is the foremost translation as apposed to the secondary cross in this the NWT is has the greater accuracy.
we are saying stake that could have had further beams or not! but there is no further biblical indication beyond what I myself researched on jesus's words themselves only indicating in prediction a pole/crux simplex/single stake except it says there was a board above Jesus's head something I don't think possible with patibulum cross which is ready made with hole in patibulum to fit over the upright stake, itself carved ready to be slotted into patibulum with the victim on it with that version there is no above head and no way to attach it before the victim is on it did someone scramble up Jesus's body to fix the sign on?