A story I want to read:
We know Sam woke up in 1973 disoriented and confused. The uniformed policeman spoke to him at the scene, causing Sam to immediately default to "senior officer" mode (albeit rather stroppy Senior Officer. I'm gonna go with the idea that being COMPLETELY TERRIFIED made him like that. I know a good jolt of adrenaline to my system makes me want to hit people), at which point he seeks out the police station like a good DCI, to find out what's going on.
What if the first person Sam had run into in 1973 hadn't been the beat cop? What if it had been Vic Tyler?
Still dazed, Sam probably wouldn't have recognized him until Vic introduced himself, at which point he would have thought it was all a dream and abandoned any idea of going to the station. Instead, he would have followed Vic quite happily to see what happened next.
By the time he realized he wasn't waking up, he'd have gained Vic's trust and be privy to some of the more unsavory activities that Vic was up to. There wouldn't be anybody in this time period that he knew and trusted enough to be able to tell them what was going on; he wouldn't have any reason to think that anyone in the police force would either believe him or bother to take action. For reasons given below, he showed up without a police ID, so he doesn't know he has any official standing himself. And the run-ins he's had with the police so far have convinced him that they're all incompetent and most of them are corrupt.
And he's still got all the Vic-issues that he was saddled with in the original series; he wants him to go straight, he doesn't want him to go to jail. Only now he's helping to aid and abet the crimes Vic's committing, and he doesn't know how to get out of it, because he's seen what happens to the people who let Vic down.
Meanwhile, Gene's been notified that Hyde has sent a detective undercover to infiltrate the Morton Brothers gang (not one of Gene's men because they're local, and therefore more likely to be recognized). He's impatiently waiting for this guy to get in touch with him as previously arranged, but lack of communication and what he's hearing on the streets convinces him that his contact is compromised--has fallen in with the gang. And if there's one thing Gene really hates, it's a copper gone bad.