I recommend you to listen to Scott Allen's program on the roar if you are going to criticise Horwill's play on this tour. He has analysed the first two games so far in a method that another site Gagger linked to does with regards to ruck effectiveness (i.e. What impact a player has on a breakdown, not just who was first). He noted that based on the England and Italy games, Horwill was ranked the highest based on what effective involvement he had, as opposed to just the number of them.
I think this is a point that people quickly overlook. A player first to a ruck to bridge over a player looks good. Second man in who cleans out an opposing jackal gets forgotten.
On Simmons, if you believe he had only 2 decent test standard games, I implore you to actually watch his involvement and compare it to that of others. Bledisloe 1, Bledisloe 3, the Italy, Ireland, Scotland and Wales games off the top of my head were all solid international lock performances from him. Not saying he's setting the international bar, but performed adequately as an international lock.
I'm not saying the bloke's play is peerless and doesn't need improvement, I just challenge anybody to prove it's inadequacy.
Once again with Skelton, I don't see how he could ever be the best of the lot. he's big and physical, but that means he will be too large to be as effective a line out jumper as Simmons or Pyle, which is one of the lock's key jobs.
Saying he jumps doesn't mean he is a line out leader, key target and quality jumper. Simmons can out-manoeuvre opponents in the air. Skelton never will, not because I don't think he is capable of developing the speed up and skill to do it, but because to do it, it would require the Waratahs sacrificing their line out for him to develop in that role and they aren't going to do that. Dennis will merely step up as a key jumper as he already does.