So I let Erik the Slayer go in a random town (dont remember what town), did some quests then went back to his location in Rorikstead at the Inn and he was not there. I even waited like 5 game time days and still no sign of him. He's not at my house either. He has a crap ton of stuff on him from me. Whats goin on here? Tried looking this same problem up, but no answers.

That EXACT thing happend to me last week. I had Erik, and he was replaced by a Companions Guild follower for a quest. I guess he came back to Rorikstead, i thought.
He never came back.
I went to Morkrath and met Cosnach, who is like Erik, but enjoys to brawl and drink. I like him 10x better!
He is my drinking buddy, and dragon slayer companion!

LOL yeah I had him too. Married him, he said funny stuff, but I got bored and didnt like his voice, so I killed him LOLOL!

Jerk....

hahahahahahah