Dude, you're making a mountian out of a molehill. Researching random clues that an event would occur after the fact is child's play, intel wise. People will be doing it for decades with 9/11. The trick is that ChiefKujo didn't give them any reliable or actionable information, and what he did give couldn't be verified until well after it was common knowledge.
Intel analysts look for patterns, past behavior, and capabilities. Think abuot it. Military rumors about VIP visits are a dime a dozen, especially when you're close to the flagpole, or during certain events. Also, U.S. Presidents visiting troops don't do it secretly, especially when they would have to fly across the planet to do so. Just think of how shocked you were to hear of it in the first place. It's unheard of.
Yes, we now know Bush had the capability to do what he did. Also, a lone anonymous poster on an 'non mainstream news website' that is generally regarded as a little off kilter suggested that he *might*. Assuming that they have guys on FR at all times (which is a absurd stretch) that's not much to go on. No intel guy in his right mind would suggest that it's anything more than an internet rumor, especially when the rest of the known media world was saying he was at Crawford.
(This also hinges on the assumption that they would WANT to kill the President, but that's another topic entirely.)
In hindsight, and with a little research, it's easy to connect the dots. Your dilligence and concern are commendable, and I don't mean to encourage poor OPSEC or blatant security breaches. Having some knowledge of how things work, I just wanted to point out that I didn't think that CK endangered the President in the any meaningful way.