Here is the order I blame them:
1.) Chris
<large gap the size of football field>
2.) Kirk
3.) Colleen
Chris is the main person to blame for this loss. He had 2:30 to himself to bring the artifact out, but he moves so slow and gets lost in every single room. Even after grabbing the artifact with 53 seconds left, he doesn't even come close to bringing it out. -_- This was an easy layout, but Chris blew his load. Even if he followed Kirk's advice to take the bottom floor, 53 seconds was more than enough time if he put his ass into gear. I mean David from "Lawrence of Arabia" got his artifact out in 25 seconds and he had one less room than Chris to run through.
Next is Kirk. He really didn't know what he was talking about in Season 1. I know it was like a "spur of the moment" thing, but taking the bottom floor was just useless advice. Luckily, he is a little more intelligent in the later seasons.
Finally, I believe that Colleen deserves some blame too. I mean if she looked at the Treasure Room bar for a second longer, then she would've seen the door open AND get a solo shot. But in her defense though, the bar was sort of delayed in opening too. So its not like she was completely oblivious.
I blame 95% of this loss on Chris, 4% on Kirk, and 1% on Colleen. This run should've been a win easily, but Chris just ruined it big time.