I just don't see how TG could have been that far off with his estimate, to be honest.
According to Ollipop, the gas station is less than 1 minute from where the girls' bikes were found. Doing a little googling reveals the interesting fact that men, on average, spend 30 seconds in a public toilet.
That makes TG's estimate of 12:20 pm for seeing the bicycles a generous one. Assuming that it actually took TG 19 minutes to ride to the gas station, go to the restroom and then call his daughter seems unlikely to me.
I also don't see how the girls could be at the park at 12:12 pm and then on the Lederman's Big and Tall video at 12:15 pm (I think they are two different videos, shot from cameras relatively close together; I wish we could get a definitive word on that).
I'm not at all convinced the girls were lured. I think they were grabbed or, more specifically, one was grabbed and the other complied to avert threatened harm to the first.
I think it's possible that the girls were obediently sticking close to home for the first 45 minutes or so. They'd zip by home every 5 to 10 minutes so Grandma could see them (otherwise, why did she get so worried when she hadn't seen them for 15 minutes?).
And then, maybe, they got a little bored. And being kids, they egged each other on into a race to see if they could get away with it without Grandma noticing.
Huh. Here's a thought. When Abben said the video showed them headed away from the park, maybe he meant that the bicycles were found pointed in the other direction.
I don't know.