Pretty obvious walls. Doesn't even try to hide it.
I'm pretty sure he has aimassist as well. Most of his gun kills seems like aimassist.
(Not a huge deal. Walling either way)
2400 - He joins at beginning but start at this tick
2650 - Watches T
3000 - Prefires
3300 - Watches T surf
3500 - Headshot w/machine gune
3700 - Traces T and kills with awp
3800 - Traces T up top
3900 - Aug headshot
4000 - Watches T through walls
4400 - Kills with sig
5000 - (Useless but hilarious) Surfs away but fails. Falls, dies.
5800 - Shooting through wall/breaking barrier
6650 - Kills T with aug
6900 - Headshot with sig
I think this is more than enough evidence. Blatantly walling...