i'll let rico go ahead and continue to batter your already poor image in regards to your personal attacks on him.
i haven't played much with you as you're usually on zmod, but i can tell from the posts i've seen from you that you're far too impulsive and self-assured about every ban you make. you take a few questionable ticks, blow them out of proportion, and make a ban. you also rarely add descriptions to what you're seeing, which is critical in difficult cases. admins need to establish dialogue to discuss what they're seeing. you don't do that. it's nice that you try, but you need to sharpen your skills a lot more and you need to be a bit more humble. you're not the great hacker catcher you think you are, far from it. get off your high horse, take time to look at other ban threads (not to toot my own horn but especially look at ones from me, cyber, steamer, and penis.) and see what we look for, what we see, and how we discuss what we see.
sorry to be off topic. as far as this case goes, fishy indeed but i've seen the same sort of play out of myself and other good, legit players. one of those guys we could keep an eye on, but i wouldn't ban from this.
for catching walls in particular, you have to look at their patterns and playstyle if it's not completely obvious. see how/if they change their movement or looking patterns based on the movement and placement of enemies they shouldn't know the whereabouts of. also watch how often they prefire, check corners, etc. as a good prefire can look like obvious walls, but could be just lucky guessing.