These guys are just having trouble with the MATH as you correctly point out. The figures I keep using are typical and nominal (based on math such as the 208 derives from 120 x square root of 3 etc) and science, but that dont mean any given voltmeter is gonna yield those exact results. The laws of physics and math must apply and the Y and Delta configurations I keep quoting them are correct based on vector sums and pretty basic trig etc. Also a non electrical person has a tough time with Y versus Delta when they start throwing out figures they heard about somewhere down at the pool hall.
But hey God Bless them all, they have some good questions, and I still try my best to help and will keep doing so and thanks to you also