@InfraBlue,
Those are interesting thoughts, but there is something else to consider.
It is noteworthy that the Bible also uses the word xy′lon to identify the device used. A Greek-English Lexicon, by Liddell and Scott, defines this as meaning: “Wood cut and ready for use, firewood, timber, etc. . . . piece of wood, log, beam, post . . . cudgel, club . . . stake on which criminals were impaled . . . of live wood, tree.” It also says “in NT, of the cross,” and cites Acts 5:30 and 10:39 as examples. (Oxford, 1968, pp. 1191, 1192) However, in those verses KJ, RS, JB, and Dy translate xy′lon as “tree.” (Compare this rendering with Galatians 3:13; Deuteronomy 21:22, 23.)
Also, The book The Non-Christian Cross, by J. D. Parsons (London, 1896), says: “There is not a single sentence in any of the numerous writings forming the New Testament, which, in the original Greek, bears even indirect evidence to the effect that the stauros used in the case of Jesus was other than an ordinary stauros; much less to the effect that it consisted, not of one piece of timber, but of two pieces nailed together in the form of a cross. . . . It is not a little misleading upon the part of our teachers to translate the word stauros as ‘cross’ when rendering the Greek documents of the Church into our native tongue, and to support that action by putting ‘cross’ in our lexicons as the meaning of stauros without carefully explaining that that was at any rate not the primary meaning of the word in the days of the Apostles, did not become its primary signification till long afterwards, and became so then, if at all, only because, despite the absence of corroborative evidence, it was for some reason or other assumed that the particular stauros upon which Jesus was executed had that particular shape.”—Pp. 23, 24; see also The Companion Bible (London, 1885), Appendix No. 162.
Thus the weight of the evidence indicates that Jesus died on an upright stake and not on the traditional cross.