Agree entirely.
What’s also worth mentioning in support of the door being Rahim’s, is that his story arc to date has been too brief to cut short.
It would be unnatural to introduce Rahim within three episodes, rapidly build up a “love triangle” and then entirely discard that idea and have Victor go straight back to Benji in episode 1 of season 3.
They’ll need content for season 3, and it can’t just be more Benji and Victor without a major complication.
I’m sort of disappointed that they’ve already skipped ahead on Benji’s and Rahim’s character development in several instances, making it hard to go back and fill that out in season 3.
I also agree that it would be unnatural for Venji to re-connect so early in season 3. They both need time apart to figure things out, but I do believe the predictable way that Victor will regain Benji's trust and love will involve supporting him during his season 3 booze relapse, even when Benji pushes him away!
For example, Benji apparently doesn’t do anything that isn’t about Victor and Rahim goes from having parents that are strictly conservative to being a-ok with his sexuality abruptly. I think the writers are doing the show a disservice by not expanding these areas. It’s now also too late to go back and focus more on Victor and Benji’s awkward first times — the one second lube scene was hardly sufficient (or accurate to the discussions/experimentation/teaching that could have taken place between Benji and Victor).
Had these been expanded to land us in a different place in season 3, we wouldn’t be stuck with a third season still centred around relationship troubles.
Overall, I think we could see:
Victor say “Hi” to Rahim, only to have a debrief about Victor/Benji and have Rahim say that Victor isn’t ready for a relationship — leaving Victor with no love interest for a few episodes and a time to “be single and work on himself” (a sort of narrative reset). Alternatively, we could, as you said, see a few episodes with Rahim as a love interest before returning to Benji by the end of the season.
That’d leave the writers in a position to make a fourth season about Benji and Victor’s long distance relationship and going to college or whatnot (if the series survives that long).