Normal Vorazun can’t “handle” the first wave on RtK, not on Brutal anyway. You either cheese it with your Dark Pylon (and hope you don’t get Vikings) or you make a Forge and put down 2-3 canons, if ally is doing nothing. You’ll also probably need to drop a blackhole to ensure canons kill off that first wave. Or you take 30 secs of damage and then drop SG.
If you’ve done just the 22/8 split on Chrono/SoA then Normal Vora and P3 Vora have the same issue anyway. The first wave hits by 2:30 so you can’t use SG that early. And then you’re taking 30 seconds of damage until SG.
For P3 Vora with the 5-min TS bug/nerf yeah that delays the expo way too much. If it’s a normal 4-min TS then use that one to clear your ally’s expo and the first shard. As I mentioned, if the 5-min TS is an intentional nerf and not a bug, it’s definitely a hard no for me: