According to the WTS - Stauros means an upright stake, or pale in Classical Greek.
The problem with this is simply that Classical Greek hadn't been spoken for centuries before Jesus Christ was born unto Mary.
In Koine Greek [the new testament is written in Koine Greek which is Hellenistic] stauros means an upright stake with a cross beam above it, or two intersecting beams of equal length, or a vertical, pointed stake.
If Christ was killed on just an upright stake the writers of the new testament would probably have used the word Skolops.
Further evidence against the torture stake idea can be found in John 20;25 when Jesus is discribed as having prints of the nails in his hands. There is no evidence at all that Christ was killed on a stake, but plenty of art depicting Jesus on a cross. Additional archaeological evidence to support the crucifixion has been unearthed in the city of Herculaneum where a whitish stuccoed panel shows the imprint of a large cross, probably metallic, that had been removed...Before it are the remains of a small wooden alter charred by the lava from the eruption of Mt. Vesuvius in 79A.D. It seems almost impossible that the details of his death could have been lost so soon after his death.
respectfully,
dc