Saw has 8 cars. It used to run all 8 until a few years back (my memory is hazy...I want to say like 2018/9, but could be wrong there). I believe there was some operational reasoning behind it; the throughput on 8 isn't substantially greater than on 7 for the additional maintenance and engineering costs sounds plausible enough, but I could be pulling that out of my backside.
5 is the bare minimum that Saw runs on. To run it on that on a Saturday is...interesting. It would be very unusual for the park to actively choose to run it on 5 on a weekend imo, especially when the park have been largely very good at running rides on a suitable capacity the last couple of years in particular. But equally, it would be unusual for at least 2 cars to be out of order (depending on if the 8th car is also receiving maintenance as part of a cycle).
So yeah, unusual.