Right. That's why to me the bike rider makes sense. I can't think of one reason why it wouldn't. Rode the road before and saw her. lives local enough if he's riding. Maybe used the path to relieve himself before, so knew it, knew she was out that day because he rode past her, easy to hide the bike, and a lot faster get away without too many thinking twice about seeing a bike, and if not knowing better, even if he had a backpack to put her clothing etc in (if he took them) wouldn't think enough about it to lock it in their brain to remember.I also think it is important to start with the basics. She is a runner. She is attacked on a regular running route that she ran. So that leaves it optional for someone who saw her regularly by location on the route or someone who had something in common with her such as exercising on the road regularly also. That is how all this could have started if he obsessed with her, came across her, talked with her, saw her, etc. And it explains why he would be outside and know of that path, if he exercised on that road as well.
Up until they find out for sure, I am open minded to any scenario, because it could have happened anyway, and I could be totally off.