The issue with SoftBank is that there is only one possible angle: they corner the market, and sell out to everyone else at a higher price.

This implies that yes, they have to double down.

The only issue is that SoftBank appears to be unaware they need an angle. They are unaware that geometry exists. They are unaware that maths exists. They just seem totally unaware.

In my experience, it is often a complete waste of time to look at someone doing something stupid and think: "They probably know what they are doing".

In 95% of cases, near 100% in financial markets, that person is just an idiot.