its really not a problem, the terminator wont be holding the overlap so you get a suitsble gap between two up trains and follow the P4 departure.
Freight is usually recessed at P5, so it will have the parallel overlap (towards the Down Slow) and the 2 minute timeout will have elapsed by the time its path is available.
At least with the closely spaced 4-aspect signalling you can depart 5 on a yellow very quickly after a platform 4 departure. The downside is that if there's a delay in 5 up departure due to doors/punters or similar after route is set, the next 4 up arrival could end up held south of the station. If there was a restricted overlap on platform 4, at least the next arrival might be brought in at restricted speed on a warning aspect, but there really is not enough room even for that with only about 30m from the gantry to the fouling point of the crossover. CARS really solves all these problems, with not only more platforms on both slow and fast sides, but unrestricted free overlaps for all routinely used moves.
