Silly debate. It doesn't really matter. It misses the point. Jesus was put to death at a pivotal point. Does it really matter at all what shape the wood thing was?
There is no proof either way. Hand-me-down stories for 300 yrs and all the translations do not matter.
I hear a lot about what was historically typical of the times. Yes, but that refers to common thieves and criminals and every day executions. They made an extra effort to make a point of displaying Jesus sentence of death. I would think they would have gone all out for the extra cross. Of course there where eye witnesses that passed down for 2000 years of the cross. Not some knuckle head from from 100 yrs ago who claim 2000 years where wrong based on a bad translation. Russell did not even know Hebrew, Latin, or Greek.
My biggest religious conundrum .... was it boxers or briefs. Does it matter?