I never said he’s ready. He’s not ready for it. With a short turnaround though that extra forward on the bench may allow more rotation to avoid forwards been flogged too much. 

If he's not ready we shouldn't be breaking him.

Mention of props makes me think of Sam Eseh's recent performances for Hull.Always had my doubts whether he,d make it, but not any more.I would keep an eye out for how he fits in when he eventually returns to Pies.

I don’t think 20 minutes or so would break him at all. That’s a big statement to make. There’s a difference in not being ready for long or repeat exposure at SL level than doing a relatively short stint on a rare ocassion. Many young players have done it in the past and continue to make the odd appearance at SL level. I have a bit more confidence in him than that and it could be a good learning opportunity. 

He may not be needed though if rotations can be worked well enough.  

Not sure I agree with you on that poptart.
Lingard is a first team squad player who could benefit from the 10 to 15 minute stints from the bench. I understand about the enormity of the opposition in the coming week, but whats been said about McMeekan Pitts and others overworking and blowing up. The experience of been in the first team 17 and helping out could have an enormous benefit to his development.
The start of this season Cauis was  only doing short stints and Vagana is relatively new to regular Rugby.
Personally I would rather see our squad get us out of the injury crisis than getting an outsider in.