The walk from Jodi's house to the entrance of the path was timed at 2 mins 40 seconds - possibly not long enough for her to realise she was being followed? Interestingly, there are two routes from Jodi's house to the main Easthouses road, so it's possible she would only have become aware of being followed (if she did become aware) once she was on the main road - that narrows the time down to 2 minutes, from when she reached the Easthouses Road to the entrance to the path. The witnesses who saw Stocky Man must have seen him within the first minute, given where on the road they saw him.
The problem with the identification of Stocky Man and AB's sighting is that both can't be correct. How could Jodi be at the entrance to the path between 4.49 and 4.54 having the possible altercation with Shaggy from Skooby Doo if she wasn't even on the Easthouses Road until 12 minutes later when she was seen being followed by Stocky Man?
Where would she have gone for sanctuary? Apart from GD (which would have still been quite a way to go from the entrance to the path, and an unlikely place for her to go) she didn't have other friends whose homes she frequented in the immediate area at that time.
There was, however, a "hideaway" under the road, accessed from the complex area - if she had been able to slip Stocky Man for just a moment or so, she could have ducked in there and would, to all intents and purposes, have "disappeared." But, and this is a big but, this would be based on the assumption that Stocky Man knew nothing about the hideaway. It is known that his closest friend at the time knew about it.
If Stocky Man sighting is correct (whether or not the identification is), Jodi did not leave her home at 4.50 (to be at the entrance to the path by 4.49 to fit with the AB sighting). If she did not leave her home at 4.50, but instead left after 5pm, she could not have been murdered at 5.15 and, because of all the other timings, Luke could not have been the killer.
It wouldn't have been "a while" before she reached her destination if, by destination, you mean the entrance to the path. Could she have been followed through the entrance to the path, and onto the path without her knowing? Possibly - at that time of the year, maybe even probably, since there were dog walkers, etc, about.
However, if Stocky Man did follow Jodi onto the path without her knowing, he was taking one hell of a risk trying to attack her on an open path and bundle her through a break in the wall. There are a couple of other possibilities - a person following Jodi along the entrance to the path could have ducked behind the big break in the wall at the junction of the paths, made his way down behind the wall, and been waiting for her at the V break. She would not, in those circumstances, have known she was being "followed." Or, on the other hand, she may have become afraid that she was being followed, and ducked out of sight behind the same break in the wall, her follower carrying on down the path before realising he had lost her, and climbing over the V break to see if she was hiding in the woodland strip.