I've never heard that Jerry Wetterling was not Jacob's biological father, can this be confirmed?
As for the phone call, from what I understand Jacob called the party where his parents were attending and asked if they could go rent a movie, his mom said no but his dad said OK, as long as they were careful. I don't see how there could have been a lot of time to then call the abductor and have this all set up since their request to go rent a movie was sudden & out of the blue.
As for the abductor asking for Jacob specifically, I've never heard that one before and I don't see why this would have been kept from the media.
Personally I think the abductor was stalking Jacob prior to this and it probably started at the hockey rink where Jacob played, because just 10 months prior to this in nearby Cold Spring, MN a man with a gun abducted a 12 year old boy who was walking home from a hockey rink and assaulted him in his car and when he finally let the boy go he dumped him out on a rural road and told him to run and not look back or he would shoot. It's too similar to be just a coincidence IMO. And I read in an article that sexual predators such as this will commit a crime toward a child, then have three months of feeling empty, and then three months of starting to look, and they’ll do it again in nine months. The time slot fits, also this mans "preference" for preteen boys who are athletic.
I think the abductor had either found out that the parents were going to be out that night or he saw them leave their home together knowing that the kids would be alone and he stalked around their home and saw the kids starting to leave on their bikes and he ran on ahead and got into place. In an interview with Jacob's friend Aaron Larsen who was there that night, about halfway through their mile-long trip, Aaron heard a rustle in the tall grass by the road.
"A little shiver went through me," he said. "I didn't know if it was a person or an animal, but I kind of sped up. I don't know if Trevor or Jacob even heard it. ... It was just a strange noise that shouldn't be there."
Not wanting the others to know he was scared, he said nothing."
I think the abductor was confused as to who Jacob was because it was so dark, and perhaps he knew Jacob was around 11 years old that's why he asked them their ages. Trevor who was 10 was dismissed first, then it came down to Jacob & Aaron both eleven years old and I think the abductor deliberated for a second or two before he was sure which one was Jacob.
(I do wonder how the abductor got away though if there was no car parked nearby, did he live within walking distance?)
I hope that this gets solved one day. I read in an article that the investigators have at least 5 suspects in this case, I'm hoping one of them is the abductor and they can finally get enough evidence to make an arrest.