Gillum was shown winning 9% of Republicans, so their lead among voters who already voted might have a small portion to do with that?
Gillum winning 9% of GOP voters seems odd. I won’t complain, but I would have to ask: why would a Republican vote Gillum?
Trying to psycho analyze RINO Tom-like Republicans is a fool’s errand
~10% crossover is fairly typical actually. Obama won 10% of Republicans while McCain won 10% of Democrats. The 2012/2016 results were pretty similar. I'm guessing it's just the same people over and over who always vote for the party they're not registered to but are too lazy to switch their party affiliation.