Question about the end *spoilers!*

well, the way I see it, once Lucas attacked him, Gabe knew Lucas was the killer, rather then Sara.

Reason:

Once the attack occured, Gabe has to have wondered why Lucas would save the woman who shot him (In Gabe's eyes). It makes no sense, unless Lucas didn't see the shooter and thought Gabe shot him. BUT Gabe knew he didn't shoot Lucas, and also knew that Lucas knew where Sara was. ("JESUS CHRIST SARAH, STAY RIGHT WHERE YOU ARE!"). If Lucas knew where Sara was, and also knew Sara didn't shoot him, then that would mean he "thought" Gabe shot him. The only problem with that is Gabe knows HE didn't shoot Lucas. Also, Gabe knew Sara was trying to put the shooting on Gabe, meaning she thought Gabe shot Lucas.

If neither Sara nor Gabe shot Lucas, then the only remaining possibility is Lucas "shot" himself, as there was nobody else left alive on the island able to get to the scene of the "shooting" fast enough (Vince was in the main building's basement getting the faulty gun clip at the time, and was dead before Gabe and Sara's confrontation)

Which brings another point up...why didn't anybody think of Vince after they found Harris dead and were turning guns on each other?

JLM does indeed have Squashed Bullets in his Bullet proof jacket when he first reveals it. He also then pulls out Squib leads. The two facts are impossible in tandem. He can't have added the bullets earlier just for this eventuality because squashed bullets fall out pretty quickly and without much shaking.

More importantly, who the hell was LL cool J's character. he claimed to be a Profiler, then an investigator, then a profiler again. Why did he keep changing his story? Why gid he switch back and forth at the moment he was trying to convince everyone he was trustworthy?

Moving on, is the Killer supposed to be a genius at preparing or McGuyver because I don't buy at all that he can be bloody great at being both. In a few hours he set up a bunch of intricate and specific traps, none of which failed (even the water/electricity one was simply a preamble to set off the harpoon one). He had never been to the place, hadn't been able to search the place alone to gather materials and he clearly wsn't loaded down when they landed with a bullet proof vest, various remote controls and squibs (ever hear of searches and metal detectors at FBI bases and helicopter launch sites?)

Nor that an seriously unhinged serial Killer (remember folks, serial killers always escalate) could stop killing to go through fBI training and then profiler training in the hope that maybe some strange and maverick trainer would put him and his 'prey' in some perfect serial killer location?

What happeend to the Puppeteer? Val Kilmer says one more person, 'the Puppeteer' would be joining them in the morning and thier job would be to profile and catch him. If this person (or the FBI agnet playing the role) hadn't been going to show up, then all the DNA sequencing and blood testing equipment was worthless (nothing to compare evidenec to) and basically nobody would ever sign off on the 'island holiday' expenses for an exercise that could be done in a classroom.