We wouldn't know because the coach hasn't given him a chance to show what he can do over the 80 mins.
If that were the case, then fair enough...
But it's not the case because Liddle played 80 minutes in 15 games last year, and in many more he played over 65 minutes.
Nobody could be stupid enough not to realise that he is shining so brightly because he's coming on with the sting out of the game and playing fewer minutes than last year, and making fewer tackles, and keeping the freshness in his legs to utilise the speed he has for his running game, could they?
I'm not saying he can't play 80, he showed he could last year. But he's more effective playing fewer minutes and staying fresher. That should be obvious to anybody...