I don't mean to insist anything. Just saying that being lucky and having fast reflexes etcetera are amongst the signs of potential force-sensitivity. Whether or not they are examples of coincidences for the character's behalf and him having exceptional physical properties or mental skills without being force-sensitive, or actual manifestations of force-sensitivity, we have no way of knowing.
You could see it like this - if an old republic Jedi would have tumbled upon Han Solo, what would he or she have thought when looking at Mr. Solo's antics for a while? My bet is that he or she would have definitely tested his midi-chlorian count and at least ask some questions and stuff. Whether or not they would have found him force-sensitive or just a statistical anomaly, remains to everyone's imagination.
Interpretations, people. Interpretations. Means that you form your own idea of what goes on in the story. Even though there hasn't apparently been any canon mention about Mr. Solo's force-sensitivity being slightly more than average, doesn't mean a thing for or against.
The Jedi learn to let the Force guide their movements. Is it so far-fetched to think that since the Force is connected to and generated by all beings, Mr. Solo's connection could possibly be just a tad bit more than average, which would mean that the Force would guide him unconsciously a bit more than average sentient in SW universe? He definitely does not consciously sense the force, nor can he affect it like the Jedi can, but that does not mean the Force could not affect him.
It would enable him to "read people" better than average person. Make him suspicious when something fishy is going on. Improve response time. Guide his hand to get a pot shot at a moving tentacle monster past his friend held by said tentacles, half-blind (I mean, is this
normal for anyone?). There are other examples as well. They might be coincidences and just general signs of Han Solo's awesomeness, but I generally don't believe in coincidences.
Not to mention that force sensitivity in SW universe could actually been as an explanation for things such as luck... Those with a bit better force-sensitivity than others are sometimes "guided" more than others, making them appear luckier... or unluckier, or otherwise exceptional. Obi-Wan certainly thinks that there's no such thing as luck... And Mace Windu has stated that there is no such thing as coincidence. Which is pretty much the same thing.
Besides, it's a better explanation for Character Shield than most others.
