League-of-legends – How to get the statistics of LoL which is not shown in the official site

It is not a game feature nor a Hack.

The 6th player is a Mod/GM that can only be added by Riot staff; this player has the ability to see the map without fog of war and it is also capable off seeing both side stealth units.

Unfortunately I dont have a source to back up my statement, you can check on any of the matches where a 6th player is, at least one of them will have the name of a Riot employee, most likely Phreak and the game type play is a Draft Pick Custom Game.

To answer your questions:

• In your build I would take Warmog's Armor or Guardian Angel as the last item.
• I think Infinity Edge is better since it works well with Atma's Impaler

However, you cannot think like that. There is no build which is generally good. Sometimes it is better to get this item othertimes that item.

If you want a general build for Yorick I would go for this one:

• Boots of Speed + 3 or 4 health pots (4 pots - when solo top, wait near the fountain and buy 4th pot ASAP)
• Tear of the Goddess => Manamune
• probably Mercury Treads unless they have a heavy ad team, then I would go for Ninja Tabi
• straight for Atma's Impaler
• Warmog's Armor (tankier build) or Frozzen Mallet (better chasing)
• The other one of the previously mentioned items or the new item Maw of Malmortius
• Trinity Force (damage) / Guardian Angel (tanky build) / Infinity Edge (in case I have Frozen Mallet)

In case of a need I would upgrade boots before finishing Manamune, but after Tear of the Goddess. If I woudlnt be doing very well I would also get Wriggle's Lantern after Manamune or even before that and Spirit Visage, but those are items you want to sell in late game.

Early boots upgrade and Atma will give you enough resists and in combination with Manamune you will have circa 250 AD.

Finally, I think that Yorick is better with a tankier build rather than AD.

Ad NOTE: I think Nasus benefits more from a far different build. Urgot is also good with Manamune and Atma, but before Atma he really needs Brutaliser and after Atma it is better to go different items. You can also build Frozen Heart before Atma which makes you even tankier and gives you some damage, too (since you have Manamune).