Still_Nutty
Josh Smith
Sterlo (and his look-a-like Paul 'Squizzy' Taylor) were both capable of tackling in the front line of defence and Taylor was capable of racking up 40 or 50 tackles in a game, when he played in the line...but he did also play fullback for a period of time at Parramatta. Turvey was definitely your more classic cover defending halfIn the very old days they used to play halfbacks as a 'second line' of defence. Basically they'd stay 10 metres behind the defensive line and try to read where line breaks were going to happen and try to tackle anyone who made a line break from the side or behind.
Stops you having a weak defender in the line for forwards to run at and gives you some cover defence other than just the fullback.
I'm sure there's a reason they stopped doing that in the days of Peter Sterling and Steve Mortimer, but it seemed to work in those days.