Bunk, you can lock the ARB in while moving, just don't have the wheels spinning at different speeds, so basically let off the gas. No need to stop.
Seizing the gears to the crosspin isn't caused by locking in under throttle. I'd need to see the crosspin to make a call, but it wouldn't be from locking in under throttle. Chewing up the teeth on the locking collar yes, but not siezing the shaft, unless it had been going on a long, long time.
The rearend was maybee 5 months old. Ask Chris how fawked it was. We had to replace 75% of the chunk. The cross wasnt seized to the gears, It was basically welded to the case. I still like my buttons, But im getting tired of axle work being required.