Maybe a missing cable for crank sensor?

I have a 2001 mitsubishi eclipse rs 2.4L that won't start. I replaced the starter, battery and spark plugs. Hoping someone can shed some light. It is cranking but ultimately won't turn over and start. Someone said it could be a bad crank position sensor? I was doing a little looking in my engine bay and found a cable that's unplugged and can't find the other end. Wondering if it's the problem.