I genuinely don't understand the difference between a 4-series Gran coupe and a 3-series GT. Here's how I see it (attempted to rationalize using pictures) - so the 3-series GT is a 4-door coupe version of the 3-series.
That makes sense. And a 4-series is just a 2-door 3-series, that also makes sense.
But when you add 2 more doors back onto the 4-series it turns back into a 3-series.
And then when you make it a coupe it becomes a 3-Series GT. Right?
They're literally the exact same car! Sombody please explain it to me.