Firstly, my bad. Secondly ... not true. The last 2x we ran it I ran middle completely solo. It's REALLY easy with NTTE on a sunbro titan. Granted, I did not choose to run it solo but it didn't seem any harder than when I run it with the assistance. You can melt 99% of the mobs a they walk out the doors. Most of the time even solo you'll only have to worry about the 3 thralls spawning behind you and the occasional knight. You can even call glyphs and activate the mid platform yourself readily being most of the time mid is either 2nd or last because once you call yourself you're either going to the one that isn't called or to you directly so it's not like you have to stand there long.