Okay, here it goes, I have no chance of giving you the right answer, but I will do my best.

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1. I dont have Andrew Raines or Liam Anthony.
Go f**k yourself, you lucky prick.
My Verdict: Just leave a comment in this blog reading "Suffer in your jocks" and bugger off.

2. I dont have Andrew Raines, but I have Liam Anthony.
Most definitely trade Liam Anthony, but save it until next week.
My Verdict: Trade Liam Anthony for Robinson, next week.

3. Andrew Raines is my 7th back, and I dont have Liam Anthony.
This is a pretty easy decision. Since you havent been a rookie on the ground. Simply play one of your current rookies, and trade in the best rookie, with the lowest breakeven next week. If you dont have any playing bench players, look at players like Gilbert, Hurn, Pettard and Head.
My Verdict: Trade for Kyle Cheney before round 3.

4. Andrew Raines is my 6th back, and I dont have Liam Anthony.
You most definitely dont want four rookies in your backline. If Pettard is your 7th back, got for a rookie. If your 7th back is Hill, well look into a sideaways swap for either Gilbert, Hurn, Pettard or Head. If you have coin, you might as well upgrade him and forget about it but I would imagine most wont. But, most definitely dont pick 4 sub-$150k players, as only 5 got a game in Round 1. Benching Raines is also worth looking into here.
My Verdict: Trade for Ricky Pettard this week.

5. Andrew Raines is my 7th back, and I have Liam Anthony.
Trade Raines this week, worry about Anthony next week. I would look at downgrading Raines to either Kyle Cheney (119) or Jared Petrenko (65) depending on your current set up. That gives you a couple of choices with Liam Anthony, but I think the best would be a straight swap with Robinson if he gets named round 3. If you have coin, I would also look at trading Liam Anthony for Travis Tuck this week.
My Verdict: Trade for Kyle Cheney this week, then you have a week to decide whether to upgrade, straight swap or keep Liam Anthony.

6. Andrew Raines is my 6th back, and I have Liam Anthony.
Well, your screwed. Unless you have 100-150k in the bank so you can pick up a possible keeper for Raines and forget about it. But those who are no Richard Branson could pick up any of Head, Hurn, Pettard or Gilbert for Raines but most definitely dont get another rookie. Liam Anthony for Robinson the following week looks like the best bet.
My Verdict: Trade for Ricky Pettard, then you have a week to decide to straight swap or keep Liam Anthony.

Some other questions that some may be interested in...

Would it be alright to use two trades this week? Most definitely not. If you copped two injuries this week, means the same could well happen next week. Unless you are upgrading Liam Anthony, even then I would say have another week with Rich or Otten playing then upgrade him the following week. Also, if you got Cousins aswell, 2 trades is a must.

What are your thoughts on holding on to Liam Anthony? I think it is too risky. But if everyone of your 30 players played this week, and there is some nice cash cows on the way already, will you really need that extra one? Probably not. Those who missed out on Robinson and have Beams in their side should look more towards trading than the others. There is so many factors that come into it.