I already posted this in a previous thread, but my theory is that the cyclist and runner knew each other.
The runner could have been running from something he may have done in the park, contacted the cyclist to bring him other clothes (perhaps had DNA or blood over his clothing)
Cyclist goes back and gets rid of the orange jacket the runner was wearing, whilst the runner walks round another way to the start of Oak Road again (where he originally came from).
The runner and cyclist then walk together from Oak Road towards Clough Road. They may have “finished something off” or removed evidence, which the runner originally was doing before he got disturbed, which explains why he was running.
The two walkers, one has a white hat like the cyclist, the person next to them are wearing black trousers like the runner.
This would explain why the police were searching for discarded clothing.