E6,
On 16 anything 4 nm behind is just about right for a landing clearance with traffic rolling under control to the end.6nm is plenty of room.However where Mr Horgy stopped his 738,could add about 1-2 miles spacing on final.
I caused a go-around some time back,by vectoring a jet 3 miles behind a Dash 8 at night on 16.The Dash 8 did the same as Mr Horgy,and the tower just ran out of room.
It still can be resolved with standard R/T,and not what Mr Horgy got.