I know nothing about how a bike will behave when dumped in water. But, I do know that my 25lb (about the same as the bike) daughter sinks like a stone, even with the floaty noodles, in a pool... Kidding. Kinda. I do think a bike will eventually float down a bit with the current, but it will take a while and there is nothing in the statements released by LE to say it wasn't submerged in shallow water, kept in place by silty sand. A boat is a possibility, but then why the tire tracks and why the statement that the bike was dumped the morning of the disappearance. Ugh, so much we don't know and so much (I believe) is being kept from the public (for good reason, I'm sure).
I think it was a planned abduction. I don't think the perp knew, or maybe had ever seen Mickey before, but I think he went out that night with the idea in his head that he would find and take a girl. A different kind of "hunter". I don't think he was panicked, bc I think he had been planning this for a while or maybe had done it before. It reminds me too much of Sierra. Unfortunately...